1. They think the owner of the house is aboard →They owner............ 2. we didn't go on holiday because we did not have enough money →If we......... 3. The children couldn't go swimming because the sea was rough. →The sea was too....... 4. The mechanic service my car last week ->I.............. 5. I'm always nervous when I travel by air -> Traveling .............

`1.` The owner of the house is thought to be abroad

`-` Bị động đặc biệt:

S +  tobe + though/said/... + to be + adj/N

`2.` If we had had enough money, we would have gone on holiday

`-` Câu điều kiện loại 3:
If +  S +  had + V3/ed  + O, S + would/could+  have + V3/ed + O

`->` Diễn tả giả thiết không có thật ở quá khứ

`3.` The sea was too rough for the children to go swimming

`-` S + tobe + too + adj + (for + O) + to_V + O

`->` quá cho ai làm gì

`4.` I had the mechanic service my car last week

`-` have sb do sth : khiến ai làm gì

`5.` Traveling by air makes me nervous 

`-` make + O + adj : khiến ai đó như thế nào.