В пособии рассматриваются основные моменты английской грамматики: части речи имя существительное, имя прилагательное и наречие; видо-временные формы глагола; модальные глаголы; неличные формы глагола

J. just, like only, should precede the word it qualifies:
I’ll buy just one. I had just enough money.
It can also be placed immediately before the verb:
I’ll just buy one. I just had enough money.
But sometimes this change of order would change the meaning:
Just sign here means This is all you have to do.
Sign just here means Sign in this particular spot.

7. Mid-position (details)

1. In general, mid-position adverbs go before the verb, but they go after am,
are, is, was, were even when these are main verbs:
I often go to the theatre. She is often late.
2. When a verb has several parts, the most common position is after the first
auxiliary verb.
We have always lived in this house.
You should definitely have been working this morning.
Other positions are possible, particularly when the first part of the verb
phrase is a ‘modal auxiliary’, or used to or have to.
You often must be bored. (Or: You must often be bored.)
We always used to go there in May. (Or: We used always to go...)
When an auxiliary verb is used alone instead of a complete verb phrase, the
adverb comes before it.
‘Don’t trust politicians.’ - ‘I never have, and I never will.
When adverbs of manner go in mid-position, they are normally put after all
auxiliaries:
Do you think the repair has been properly done?

VERB

THE PRESENT TENSES

There are two present tenses in English:

I. The Present Continuous: I am working.
II. The Simple Present: I work.

THE PRESENT CONTINUOUS

1. Form

The present continuous tense is formed with the present tense of the auxiliary
verb be + the present participle:
I am working I am not working am I working?
am I not working (but aren’t I working? - negative construction)