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Conditionals

There are four basic conditionals in English. The General Conditional is used to express habit or routine, and takes the Present Simple. (If + Present Simple.)

He gets sick if he eats too much.  If I feel bad I don't go to work.

The second conditional is used to express result in the future, and takes the modal verbs will, won't and might. This is the Present Real Conditional. (If + will, won't or might.)

If it rains we'll stay home.  He won't come it he's sick.
I might go if it's sunny.

The third conditional is the Present Unreal Conditional. It is used
to express an unlikely or hypothetical situation, and takes the Past Tense. (If - would + Past Tense.)

If John studied he would be a good student.
If she ate less she would lose weight.

It is also used with adjectives:

I would buy the car if it were cheaper.
If he were friendlier we would like him.

The fourth conditional is the Past Unreal Conditional, and is used to express an impossible situation. It requires the Past Perfect Tense. (If - would have + Past Perfect.)

If I had known, I would have told you.
I would have gone if I had felt well.

Conjunctions

Some common English conjunctions are below:

Would you like coffee or tea?
I bought the sugar and salt at the shop.
I asked him, but he didn't answer.
The movie was boring, so we decided to leave.
He got sick because he ate too much.
I'll tell her if I see her.
We'll leave when the guests arrive.

Connectors

Connectors are used for agreement and disagreement.

I'm an American.  So am I.
We aren't hungry.  Neither am I.
He's from New York.  I'm not.

I like pizza.  So do I.
I don't like chicken.  Neither do I.
We play football.  He doesn't.