Question

Use should or had (to) with the correct form of the infinitive in brackets. 1. We ... (to call) on him yesterday, but we were too busy as we ... (to attend) an extra meeting. 2. I ... not (to tell) him this news; he was so much upset, but I really ... (to do) so, for the circumstances demanded that. 3. You ... (to see) him dance! You have missed a lot. I ... (to take) you to the concert. 4. It was very hard work but we ... (to do) it. 5. She ... (not to let) it pass like that, she ... (to explain) it to him that he was wrong. 6. Although it was unpleasant to her, she ... (to tell) him that he was wrong.

Answer 1

1. We (should have called) on him yesterday, but we were too busy as we ... (had to attend) an extra meeting.
2. I should not have told him this news; he was so much upset, but I really had to do so, for the circumstances demanded that.
3. You should see him dance! You have missed a lot. I should have taken you to the concert.
4. It was very hard work but we had to do it.
5. She should not have allowed it to pass like that, she should have explained it to him that he was wrong.
 6. Although it was unpleasant to her, she had to tell him that he was wrong.

Answer 2

1. We should have called on him yesterday, but we were too busy as we had to attend an extra meeting. 2. I should not have told him this news; he was so much upset, but I really had to do so, for the circumstances demanded that. 3. You should have seen him dance! You have missed a lot. I should have taken you to the concert. 4. It was very hard work, but we had to do it. 5. She should not have let it pass like that, she should have explained it to him that he was wrong. 6. Although it was unpleasant to her, she had to tell him that he was wrong.

In these sentences, "should have" is used to express a missed opportunity or regret about a past action. It suggests that the action was desirable or expected but did not happen. "Had to" is used to express a necessity or obligation to do something in the past. It indicates that there was a requirement or external pressure to perform the action.