Jawaban:

1.

(+) Mr.Ahmad waiting for you at the lobby one hour ago

(-) Mr.Ahmad doesn't want to waiting you at the lobby

(?) Did Mr.Ahmad waiting you at the lobby one hour ago?

2.

(+) You planting some flowers last week

(-) You didn't plant some flowers last week

(?) Did you plant some flowers last week?

3.

(+) Sani watched tv almost last night

(-) Sani didn't watch tv last night

(?) Did Sani watch tv almost last night?

4.

(+) The girls buys some meatballs last sunday

(-) The girls didn't buy some meatballs last Sunday

(?) Did the girls but some meatballs last night?

5.

(+) The boys playing football last wednesday

(-) The boys didn't plays football last Wednesday

(?) Are the boys plays football last Wednesday?

Info :

(+) Positive

(-) Negative

(?) Interrogative

I hope this helps you :)