3, If I didn't lose the key, I could get into the house
4, They are not old enough to join the army
5, If you don't invite her, she won't come
6, The picture can't be hung on the wall because it is heavy
7, They were not only tired but also hungry
8, Finishing their work, they went home
9, If she didn't go out in the rain, she wouldn't get wet
10, Tom is not strong enough to lift the table

If I lost the key, I can't get into the house.

They are not old enough to join the army.

If you don't invite her, she won't come.

The picture is too heavy to hang in the wall.

They were not only tired and hungry.

Finishing their  work then they went home.

If she goes out in the rain,she will get wet.

Tom is too weak to lift the table.