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3. I lose the key, so I cannot get into the house
>If
4. They are too young to join the army.
→ They are not
5. She won't come unless you invite her
→ If
6. We can't hang the picture on the wall. It is heavy.
→ The picture.
7. They were tired. They were hungry.
→ They were not only
8. They finish their work. They went home.
→ Finishing.
9. She goes out in the rain. She gets wet.
→ If
10. Tom can't lift the table. He isn't strong enough
→ Tom is