Forms of Verb

be

am

was

were

while his brother discusses the effects of pollution.

while his brother discussed the effects of pollution.

while his brother was discussing the effects of pollution.

while his brother had discussed the effects of pollution.

she was deemed incapable of completing her research

the authority believed she was not really able to complete research

it was decided that she was not capable to complete research

her ability to finish research was not trusted

he was a child

he is a child

he has been a child

he were a child

when he has heard that something moved in the bushes.

after having been heard the movement among the bushes.

after it was hearing movement among the bushes.

when it heard the movement in the bushes.

slept

were sleeping

has been sleeping

had slept

to his driver’s test

in passing his driver’s test

to have passed his driver’s test

passing his driver’s test

when the bell rang

than the bell rang

the bell rang

after the bell rang

been to

been on

went to

went on