because I had not studied.

because I not studied.

because I study

because I was studying.

when I arrieved at the station.

when I arrieves.

when I have arrieved.

when I had arrieved at the station.

because she receives bad news

because she has received bad news.

because bad news.

because she had received bad news.

when the poliece arrieves.

when the police arrieve.

when the police arrieved.

police arrieved.

I had already finished high school.

I already finished high school.

I had already high school.

my family has already has lunch.

my family had already had lunsh.

my family had already had lunch.

she had left

she left.

I do the dishes.

I did the dishes.