12) He always turns on the lights when going to bed. 

→ I suggest that he should turn off the lights when going to bed. 

We had to stop working because of the heavy snow.

→ Because it snowed heavily, we had to stop working

17) The water bill was enormous because there was a crack in the water pipes

→ Because of a crack in the water pipe, the water bill was enormous

Công thức :

1. 

suggest+Ving

suggest that+1 mệnh đề(S+V)

=>gợi ý ai đó làm gì.

2.

Because + mệnh đề

Because + Đại từ/ danh từ ( cụm danh từ )

I suggest that he should turn off the lights when going to bed.

Because it snowed heavily, we had to stop working

Because of a crack in the water pipe, the water bill was enormous

cấu trúc :

suggest+Ving suggest that+1 mệnh đề(S+V) 

Because + mệnh đề Because + Đại từ/ danh từ ( cụm danh từ )