Simple tense: present and past	simple tenses do not normally have an auxiliary verb in affrimative sentence. Use do/does/did in an auxiliary is needes.
Perfect verb forms	present: have/has + past participle past: had + past participle future: will + past participle
Continuous (progressive)	be + verb+ ing present: am/is + verb + ing past: have/has + verb + ing
Continuous (progressive)	be+ verb+ ing past continuous: was/were+ verb + ing past perfect continuous: had been+ verb + ing Future continuous: will be + verb + ing
Modal verbs	nine ( will, would, can, could, shall, should, may, might, must) follow by an infinitive without to ( have to, need to, etc)
Subject questions
What clauses	more emphatic
Present habit (what)	actions that are repeated regularly over a log period of time
Present habit (frequency)	Simple present used with adverbs ( usually, sometimes, once a week)	A fox COMES into our garden ALMOST EVERY NIGHT.
Present habits (predictable or characteristics behaviour)	will/won't+ infintive	A hungry fox WILL ATTACK pet rabbits
Present habits (repeated behaviour (negative))	keep +verb+ ing	If your newspaper KEEPS PUBLISHING this type of journalism, tou will lose loyak readers.
Present habits (exaggerate or complain)	present continuous + always/forever/constantly	The gutter press IS FOREVER FILLING its pages with sensationalist stories.
Past habits ( past habits)	used to + infinitive and would+ infinitive to talk about past habits	EVERY NIGHT he and his dog SAT down to dinner together.
Past habit (past states qnd habitual past actions)	used to + infinitive	Each dog USED TO HAVE its own personal servant.
Past habit (habitual past habits)	would + infinitive	He WOULD DRIVE in his carriage with half a dozen dogs inside.
Past habit ( states)	We cannot use would + infinitive to talk about states.	Adolphus Cooke a firm believer in reincarnation.
Be/ Get used to	be+used to= situations or actions that are already familiar. be+get used= they are becoming familiar with the new situation.
Defining & non-defining relative clauses	Give information about a noun.
Defining & non-defining relative clauses	that, who, wich (people and things) whose (her, his, their, etc) when, where (time and place)
Participle clauses	present participle (ing) past participle (ed)