3. The boat couldn’t put to sea .

=> Because the sea is having big waves

4. they couldn’t sell their house

=>Because it's their grandfather's house

5. I can’t print out the letter .

=>Because the printer is out of ink

6. When we got to the top of the hill we couldn’t see anything .

=> Because it was covered with fog

7. She walked carefully .

=>Because she is afraid of falling

8. We must be near the beach, .

=>Because there's a storm coming

9. The Prime Minister returned home .

=>Because of urgent business

10. We couldn’t get to his house .

=> Because we missed the bus

3. The boat couldn't put to sea because of the strong wind.

4. they couldn't sell their house because their house were so cheap.

5. i can't print out the letter because of my broken  printer

6. when we got to the top pff the hill we couldn't see anything because of the fog.

7. she walked carefully because of being avoided falling .

8. we must be near the beach because we will feel relax.

9. the Prime Minister returned home because of his business

10. we couldn't get to his house because of his unhappiness

chúc bạn học tốt !!