4. THE INFINITIVE AND ITS COMPLEX
Active Indefinite: to write
Active Continuous: to be writing
Active Perfect: to have written
Active Perfect Continuous: to have been writing
Passive Indefinite: to be written
Passive Continuous: -
Passive Perfect: to have been written
Passive Perfect Continuous: -

Verbs followed by the Infinitive: offer, decide, hope, deserve, attempt, promise, agree, plan, aim, afford, manage, threaten, refuse, arrange, learn, forget, fail, seem, appear, tend, pretend, claim
Verbs followed by a question word (what/whether/how etc.) and the Infinitive: ask, decide, know, remember, forget, explain, learn, understand, wonder
Verbs followed by an object and the Infinitive with “to”: want, ask, help, would like, would love, expect, beg, mean (= intend), would prefer, would hate, tell, remind, force, enable, teach, order, warn, invite, persuade, get (= persuade, arrange for)
Verbs followed by an object and the Infinitive without “to”: make, let, see, hear, feel, smell

5. THE GERUND AND ITS COMPLEXES
Active Indefinite: writing
Active Perfect: having written
Passive Indefinite: being written
Passive Perfect: having been written

THE GERUND
без предлога: to admit, to avoid, to burst out, cannot help, to consider, to deny, to enjoy, to excuse, to fancy, to finish, to forgive, to give up, to go on, to imagine, to involve, to keep on, to mind, to miss, to postpone, to put off, to stop, to suggest
с предлогом: to accuse of, to approve of, to be afraid of, to complain of, to depend on, to feel like, to give up the idea of, to insist on, to look forward to, to object to, to persist in, to prevent from, to rely on, to succeed in, to suspect of, to thank for, to think of

7. CONDITIONALS (4 TYPES)
I тип - реальное условие:
If we send the goods by sea, the transport costs will be lower.
(If Present Simple) [Future Simple]
II тип - нереальное условие, относящееся к настоящему или будущему:
If we sent the goods by sea, the transport costs would be lower.
(If Past Simple) (should/would/could/might + Infinitive (без to)]
III тип - нереальное условие, относящееся к прошлому:
If we had sent the goods by sea, the transport costs would have been lower.
(If Past Perfect) [should/would/could/might + Perfect Infinitive (без to)]