he/study/yesterday (+) he/sick/yesterday (-) she/sad/yesterday (?) they/eat/yesterday(+) you/go/yesterday (-) we/glean/the car/last night (?) I/water/the flower

He studied yesterday
he was sick yesterday
was she sad yesterday?
they ate yesterday
you didn't go yesterday
did we clean the car last night?
I watered the flower 2 days ago
You and I didn't sweep the floor last week
Did Santi write the letter last night?
Did Sandy speak English last month?

1.he is study yesterday
2.he is not sick yeserrday
3.is she sad yesterday?
4.They are eat yesterday
5.You are not go yesterday
6.are they clean the car last night?
7.