1. He likes reading novels and listening to music.

2. He likes reading novels and to listen to music.

(Is #2 un grammatical?)

3. He proposed to go to the movies.
4. He proposed going to the movies.
5. He suggested to go to the movies.
6. He suggested going to the movies.
(Which ones are ungrammatical among #3 and #6?)

Yes, 2 is incorrect. #1 has parallel construction (reading, listening), but #2 doesn't (reading, to listen).

I'd use 4 and 6. I wouldn't use 3 or 5.

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1. No grammatical issues.

2. No grammatical issues.

3. "He proposed to go to the movies." This sentence is grammatically correct. However, it might sound a bit awkward to native English speakers. It is more common to use the phrase "proposed going" rather than "proposed to go."

4. "He proposed going to the movies." This sentence is grammatically correct and more commonly used than sentence #3.

5. "He suggested to go to the movies." This sentence is grammatically incorrect. The correct form would be "He suggested going to the movies."

6. "He suggested going to the movies." This sentence is grammatically correct and commonly used.

1. Both sentence #1 and sentence #2 are grammatically correct, but they have slightly different structures and meanings.

In sentence #1, "likes" is followed by two gerunds (verbal nouns) connected by "and." This indicates that the person enjoys both activities, reading novels and listening to music.

In sentence #2, "likes" is followed by the infinitive verb phrase "to listen to music." This indicates that the person enjoys reading novels and has a separate liking for listening to music. While this construction is less common, it is still grammatically correct.

However, in most cases, sentence #1 with two gerunds is the preferred structure to convey the idea that the person enjoys both activities simultaneously.

2. Regarding sentences #3 to #6, here is the grammatical analysis:

In sentence #3, "proposed" is followed by the infinitive phrase "to go to the movies." This construction is not common, and it is considered ungrammatical. A better alternative is to use the gerund form.

Sentence #4 is correct. "Proposed" is followed by the gerund form "going" to create a grammatically sound sentence. This construction is commonly used to indicate a suggestion or request.

Sentence #5 is also incorrect. Like sentence #3, "suggested" is followed by the infinitive phrase "to go to the movies," which is considered ungrammatical. Instead, the correct structure is using the gerund form.

Finally, sentence #6 is correct. "Suggested" is followed by the gerund form "going," which makes the sentence grammatically accurate.

To summarize, the correct sentences are #1, #4, and #6. Sentence #2 is grammatically correct but less common. Sentences #3 and #5 are both ungrammatical.