Module English: Singular and plural nouns

The verb must agree with its subject in number and person. That is the verb must be of the same number and person as its subject. If the subject is plural, the verb must be in the plural. Similarly, if the subject is singular the verb must be singular.
Incorrect: Petrol or kerosene are used.
Correct: Petrol or kerosene is used.
Two singular nouns joined by or take a singular verb.
Incorrect: A melon or grapes is suitable.
Correct: A melon or grapes are suitable.
Correct: Grapes or a melon is suitable.
When a singular noun and a plural noun are joined by or, the verb agrees with the nearest noun – it would be better to use the plural noun second; then a plural verb would be used.
Incorrect: One of my students sing well.
Correct: One of my students sings well.
Incorrect: One of the eggs are bad.
Correct: One of the eggs is bad.
A singular noun should be used after one of and a plural noun.
Incorrect: Bullets or a bomb are not allowed on the plane.
Correct: Bullets or a bomb is not allowed on the plane.
Correct: A bomb or bullets are not allowed on the plane.
Incorrect: Hundred dollars are too much to lose.
Correct: Hundred dollars is too much to lose.
When the subject is a sum of money considered as a whole, the singular verb is used.
Source: http://www.englishpractice.com/improve/singular-plural-nouns/

Module English: Uses of the relative pronouns

Uses of the relative pronouns

As a general rule, who is used for persons only. It may refer to a singular noun or a plural noun.
The student who works hard will win. (Here who refers to the singular noun student.)
The students who work hard will win. (Here who refers to the plural noun students.)
He who hesitates never wins.
They never fail who die for a cause.
Note that who is sometimes used to refer to animals.
Whose
Whose is the possessive form of who. It is used in speaking of persons, animals and inanimate objects.
This is the question whose solution has baffled thinkers of all ages. (More common: This is the question the solution of which has baffled thinkers of all ages.)
The girl in whose pool we swam was very sweet.
Which is used in speaking of animals and objects without life. It may refer to a singular noun or a plural noun.
An opportunity, which is lost, is lost for ever.
This river, which flows through London, is called Thames.
The hotel, at which we stayed, was the cheapest in the town.
Which may also refer to a clause.
The man was said to be mad, which was not the case.
He is not here, which is unfortunate.
He said he hadn’t taken the money, which was a lie.
Source: http://www.englishpractice.com/grammar/relative-pronouns-4/

Module English: Active Voice, Passive Voice

Active Voice, Passive Voice

There are two special forms for verbs called voice:

1. Active voice
2. Passive voice

The active voice is the "normal" voice. This is the voice that we use most of the time. You are probably already familiar with the active voice. In the active voice, the object receives the action of the verb:

active	subject	verb	object
		>
	Cats	eat	fish.

The passive voice is less usual. In the passive voice, the subject receives the action of the verb:

passive	subject	verb	object
	<
	Fish	are eaten	by cats.

The object of the active verb becomes the subject of the passive verb:

	subject	verb	object
active	Everybody	drinks	water.
passive	Water	is drunk	by everybody.

Now we'll look at the passive voice in more detail »

Module English: Modal Verbs (Modal Auxiliaries

Modal Verbs (modal auxiliaries)

Modal auxiliary verbs may sound difficult but in fact they're easy. They are invariable (no conjugation). And the main verb is always the "bare infinitive" (the infinitive without "to").
Can, Could, Be able to | Quiz
Can and could are modal auxiliary verbs. Be able to is NOT an auxiliary verb (it uses the verb be as a main verb). We include be able to here for convenience.
Have to, Must, Must not/Mustn't | Quiz
Must is a modal auxiliary verb. Have to is NOT an auxiliary verb (it uses the verb have as a main verb). We include have to here for convenience.
Shall versus Will | Should versus Would
People may sometimes tell you that there is no difference between shall and will, or even that today nobody uses shall (except in offers such as "Shall I call a taxi?"). They say the same thing about should, but it's not really true.
Would | Quiz
Would is an auxiliary verb, a modal auxiliary verb. We use would mainly to talk about the past, talk about the future in the past and express the conditional mood.
Should | Quiz
Should is an auxiliary verb, a modal auxiliary verb. We use should mainly to give advice or make recommendations, talk about obligation or talk about probability and expectation.

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Modul English: Kind of Verbs

Verbs

What Are Verbs?

• Verb Classification | Quiz
  helping verbs: primary/modal
  main verbs: transitive/intransitive, linking, dynamic/stative, regular/irregular

Verb Forms | Quiz
to sing, sing, sings, sang, sung, singing
Tenses
I sing, I am singing, I have sung, I have been singing, I sang, I was singing

• English Tense System
• What is Tense?
• Tense & Time
• Basic Tenses
• Regular Verbs
• Irregular Verbs
• Be

• Present tenses Simple, Continuous, Perfect Simple, Perfect Continuous
• Past tenses Simple, Continuous, Perfect Simple, Perfect Continuous
• Future tenses Simple, Continuous, Perfect Simple, Perfect Continuous

Phrasal Verbs | Quiz
put out, look after, get on with
Conditionals | Quiz
if I win, if I won, if I had won
Modal Verbs
can, shall, must...
Gerunds (-ing) | Quiz
fishing is fun, I hate working
Questions | Quiz
Do you like me?, Why do you like me?, Do you like me or him?
Tag Questions | Quiz
You like me, don't you?
Subjunctive | Quiz
She insists that he come
Active Voice, Passive Voice | Quiz
Cats eat mice, Mice are eaten by cats
Infinitive or -ing? | Quiz
I like to do, I like doing
Plural Verbs with Singular Subjects
the company do, the company does
Verb Meanings with Continuous Tenses | Quiz
Am I being silly?
Used to do / Be used to | Quiz
I used to do it, I am not used to it
Going to
I am going to do it
Future Time | Quiz
I will do it, I am going to do it, I am doing it, I do it
For & Since for Time | Quiz
for two days, since 1st April

Aliversity

It is my first note