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1.William asks, « Jack will you be free tomorrow?»
2. He asks Tom, "Are you glad to meet your former classmates?"
3. He asks, "Who has read the letter?"
4.Nick asks,"Did you see him yesterday?"

1.William wanted to know whether Jack would be free the next day

2. He asked Tom if Tom were glad to meet his former classmates

3. He wanted to know who had read the letter

4.Nick asked me whether I had seen him the previous day

1. William asked if Jack would be free the next day.2. He asked Tom if he was glad to meet  his former classmates.3. He asked who had read the letter.4. Nick asked if I saw him the day before.