If I fall ill, I will stay home.(如果我病了，我會待在家里。)

I am very healthy, and I almost do not fall ill.(我非常健康，我幾乎不生病。)

She fall ill, too.(她也生病了。)

It is easy for the old to fall ill in winter.(老年人很容易在冬天生病。)

She is afraid her husband will fall ill if he doesn't get rid of his bad habit of smoking both at home and at work.(如果丈夫不改掉在家和工作時都抽煙的壞習慣，她擔心他會因此而生病。)

In the motel, if you fall ill, you can call for the motel doctor.(在汽車旅館，如果你病了，你可以叫旅館醫生。)

If I fall ill, I'll see my doctor.(如果生病了，我會去看大夫。)

People often fall ill because of cold weather.(人們經常因為天冷而生病。)

What if I fall ill while I'm away on holiday?(如果我在放假時生病了怎么辦？)

Jack looks as if he is going to fall ill.(杰克看上去好像要生病的樣子。)