1
I try to don’t keep too much stuff in the house.
I try not to keep too much stuff in the house.
She told me to don’t do it again.
She told me not to do it again.
To make a to-infinitive negative, put not before to: ‘not to keep’, ‘not to do’.
2
It is important revise the vocabulary you learn.
It is important revising the vocabulary you learn.
It is important to revise the vocabulary you learn.
In the pattern it is + adjective + to-infinitive, use to before the verb: ‘It is important to revise.’ ‘It is easy to forget.’
3
I usually have breakfast before to have a shower.
I usually have breakfast before having a shower.
When a verb comes after the preposition before, use the -ing form: ‘before having a shower’.
Read more in our lesson on infinitives and gerunds.