you're we're who'sthey're
yourwerewhosethere
it'she'sdon'ttheir
itshisdoesn't

Explain why the apostrophe is used in the following:

1. I've received no reply.

2. This month's sales exceed last month's by one thousand dollars.

3. Politics doesn't affect the matter very much.

4. The mistake was caused by his making his 7's like his 9's.

5. Have you received the treasurer's report? No, I haven't.

Point out the mistakes in the following:

1. For sale, A ladies fur coat.

2. The boy's have gone skating.