Помогите
1 started / just / I've / exercise / this.
2 already / We've / this / grammar / studied .
3 teacher / yet / arrived / The / hasn't .
4 test / The / started / just / has.
5 finished / I / this / yet / exercise / haven't.
6 had / already / We've / lunch .

1) I've just started this exercise2) We've already studied this grammar3) The teacher hasn't arrived yet4) The test has just started5) I haven't finished this exercise yet6) We've already had lunch