Simple present

keeps

is kept

Present continuous

is keeping

is being kept

Simple past

kept

was kept

Past continuous

was keeping

was being kept

Present perfect

have kept

have been kept

Past perfect

had kept

had been kept

future

will keep

will be kept

Conditional present

would keep

would be kept

Conditional past

would have kept

would have been kept

present infinitive

to keep

to be kept

perfect infinitive

to have kept

to have been kept

present participle/gerund

keeping

being kept

perfect participle

having kept

having been kept