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with it + be + adjective/noun. It was easy to find the house after all.

after be + first/second/next/last/etc. She was the first person to congratulate me on my promotion.

after verbs and expressions such as ask, decide, explain, find out, learn, want, want to know, etc when they are followed by a question word. Their Maths teacher explained how to solve the problem.

Note: why is followed by subject + verb, NOT an infinitive. I wonder why she didn't let us know about it.

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  in the expressions to tell you the truth, to be honest, to sum up, to begin with, etc. To be honest, I don't trust him anymore.
  

Note: If two to-infinitives are linked by and or or, the to of the second infinitive is omitted.
I would like to go and visit Kate at the weekend.
The infinitive without to (also called bare infinitive) is used:

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  after modal verbs. Carol can speak Italian and French.
  
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  after the verbs let, make, see, hear and feel. They made her fill out a lot of forms.
  

BUT: we use the to-infinitive after be made, be heard, be seen
Too/Enough
We use too + adjective/adverb (for sb/sth) + to-infinitive to show that something is more than is wanted/permitted/etc. He is too young to drive. (He isn't allowed to drive.)
The suitcase is too heavy (for me) to carry. (I can't carry it.)
We use (not)... enough... (for sb/sth) + to-infinitive to show that something is (not) as much as is wanted/necessary/etc.
He isn't old enough to drive. (He isn't allowed to drive.)
The suitcase is light enough (for me) to carry. (I can carry it.)
Enough follows an adjective/adverb, but is placed before a noun.
I have(n't) got enough money to buy a new car.


UNIT 12. Conditionals
Type 0 conditionals are used to express a general truth or a scientific fact. In this type of conditional we can use when instead of if.
If/when + present simple -> present simple
If/When you mix red and yellow paint, you get orange.
If it is no longer a fact we use the past tense:
When I was a child, if I helped my mother, she gave me extra pocket money.
Type 1 conditionals are used to express a real or very probable situation in the present or future.
If + present simple….+ future simple, imperative, can/must/may/etc + bare infinitive
If he works hard, he will/might/etc get a promotion.
When the hypothesis comes before the main clause, we separate the two parts with a comma. When the main clause comes before the if-clause, then we do not use a comma to separate them.
Note: With type 1 conditionals we can use unless + affirmative verb (= if + negative verb). He will not be able to finish his homework unless Fred gives him a hand. (= if Fred does not give him a hand.)
Conditionals:Types 2 and 3
•Conditionals Type 2 (unreal present) are used to express imaginary situations which are contrary to facts in the present, and, therefore, are unlikely to happen in the present or the future. We can use either were or was for 1st and 3rd person singular in the if-clause.
We can also use the structure If I were you,... to give advice.
If + past simple/ past continuous… would/could/might + bare present infinitive
If I spoke their language, I would know what they were talking about.
If Richard was playing today we would have a better chance of scoring.
If I were you, I would apologise to her. (advice)
Wishes
We can use wish /if only to express a wish.

+ past simple/ past continuous	I wish I was at home now. (but I'm not) If only I were going to the wedding. (but I'm not)	To say that we would like something to be different about a present situation.
+ past perfect	I wish I had called him earlier, (but I didn't) If only they hadn't broken up. (but they did)	To express regret about something which happens: or didn't happen in the per
+ subject + would + bare inf.	I wish you wouldn't behave so rudely. If only it would stop snowing.	To express: a polite imperative. a desire for a situation or person's behaviour to change.

Note: If only is used in exactly the same way as wish but it is more emphatic or more dramatic.
We can use were instead of was after wish and if only.
I wish I were/was on holiday now.