Enjoy yourself. Behave yourself

5 We can use words like everybody someone with the imperative
when we are talking to groups of people [> 4.37]:
Everyone keep quiet! Keep still everybody'
Nobody say a word¹ Somebody answer the phone please
Any compounds are used after negative commands:
Don't say a word anybody! Don't anybody say a word!

9.55 The imperative with question tags [> 13.17-22]

Tags like will you?, won't you?, can you?, can't you?, could you? and would you? can often be used after an imperative for a variety of purposes: e.g.

- to express annoyance/impatience with will/won't/can't you? (rising tone): Stop fiddling with that TV, will you/won't you/can't you?

- to make a request (can you? for neutral requests; could/would you? for more polite ones); or to sound less abrupt: Post this letter for me can you?/could you?/would you?

- to offer polite encouragement or to make friendly offers and suggestions (will you? and won't you?): Come in, will you/won't you? Take a seat, will you/won't you?

- to obtain the co-operation of others with Don't will you?: Don't tell anyone I told you, will you? And note why don't you? as a tag in: e.g. Go off for the weekend, why don't you?

9.56 Double imperatives joined by 'and' [compare > 16.12.2]

Some imperatives can be followed by and and another imperative

where we might expect a to-infinitive: Go and buy yourself a new pair of shoes (Not *Go to buy*) Come and see this goldfish (Not "Come to see*) Come and play a game of bridge with us (Not *Come to play*) Wait and see. (Not 'Wait to see*) Try and see my point of view (Note Try to is also possible.)

In AmE go is sometimes followed directly by a bare infinitive:

Go fetch some water (= Go and fetch) A to-infinitive can follow an imperative to express purpose:

Eat to live, do not live to eat [> 16.12.1]

10 Be, Have, Do

'Be', 'have' and 'do' as auxiliary verbs

Be', 'have', 'do': full verbs and auxiliary verbs

Be is a full verb when it combines with adjectives and nouns [> 10.9]; have is a full verb when it is used to mean 'possess', etc. [> 10.27, 10.32]; do is a full verb when it is used to mean 'perform an activity', etc. [> 10.40]. The three verbs are auxiliary (or 'helping') verbs when they combine with other verbs to 'help' them complete their grammatical functions (see below).

Uses of 'be' as an auxiliary verb

1 Be, on its own or in combination with have, is used for progressive
tense forms [> 9.1-2]: e.g.

/ am/He is/We are working (present progressive)
/ have been working (present perfect progressive)

2 Be combines with the past participle to form passives: e.g.
It was taken [> 12.2ns.1-2]; It can't be done [>12.2n.2]