1. He suggested that she should join the club.

2. He suggested that she might be a librarian.

3. He suggested that the boy laughed at the girl.

4. The driver insisted that the car ran into the pedestrian.

5. He insisted that she should go on a picnic together.

6. He insisted that she might be a lawyer.

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Are they all grammatical? What is the meaning difference of 'suggested' in Sentences 1 through 3? Does the verb 'insisted' have the same meaning in Sentences 4 through 6?

Yes, all the sentences are grammatical.

The meaning of "suggested" in sentences 1 through 3 is the same. It implies that someone proposed or recommended an idea or action to another person.

The verb "insisted" in sentences 4 through 6 also has a similar meaning. It indicates that someone strongly asserted or demanded something, expressing their firm belief or opinion.

Yes, all the sentences you provided are grammatically correct.

The meaning difference of 'suggested' in sentences 1 through 3 lies in the level of certainty or likelihood. Let's break it down:

1. In sentence 1, the suggestion is made more directly and strongly using "should." It implies a strong recommendation or advice for the person to join the club.

2. In sentence 2, 'suggested' is followed by 'might be,' indicating a possibility or speculation. The suggestion is not as strong as in sentence 1, and it suggests that the person could potentially be a librarian, but it is not an assertive statement.

3. In sentence 3, 'suggested' is followed by 'laughed at,' indicating an observation or interpretation of an event. Here, it implies that there was an understanding or interpretation that the boy laughed at the girl, but it does not necessarily mean it is a suggestion or recommendation for the girl.

Regarding the verb 'insisted' in sentences 4 through 6, it does not have the same meaning as in sentences 1 through 3. Let's break it down:

4. In sentence 4, 'insisted' indicates a strong and forceful assertion of an event. The driver is emphatically stating that the car definitely ran into the pedestrian, leaving no room for doubt or alternative interpretation.

5. In sentence 5, 'insisted' is followed by 'should go,' indicating a strong recommendation or demand for the person to go on a picnic together. It implies that the speaker is emphasizing the importance or desirability of going on a picnic.

6. In sentence 6, 'insisted' is followed by 'might be,' indicating a possibility or speculation. Similar to sentence 2, the suggestion is not as strong as in sentence 4 or 5, and it suggests that the person could potentially be a lawyer, but it is not an assertive statement.