When Mother was sick in bed, Father was/acted father and mother all in one to us.

母亲生病后，父亲既当爹又当妈。

He lay sick in bed.

他他卧病在床。

He's sick in bed witha cold.

他因感冒而卧床。

The old man has lain sick in bed for years.

那老者病卧于床好些年了。

Of course you don't want to spend your vacation sick in bed.

当然，你不会想把你的假日因生病而花在床上。

He scraped together some money and bought some pigs to raise and slaughter, but before a month was out, he was flat on his back, sick in bed.

他省了一些钱，买了一些小猪，想把它们养大杀了。但是一个月还没过，他便卧病在床。

The mayor was sick in bed with a sudden attack of the flu so one of the city council members had to be a stand-in for the mayor and go out to meet the governor at the airport.

这句话的意思是："市政委员当中有一个人得代替市长到机场去接州长，因为市长突然感冒，病倒在床。"