1. I found it convenient to drive a car.
2. I found it convenient that I drive a car.
3. I make it a rule to get up at six.
4. I make it a rule that I get up at six.
5. I believe it useful to buy things on the Internet.
6. I believe it useful that we buy things on the Internet.
7. I think it useless to try to learn five foreign languages.
8. I think it useless that we try to learn five foreign languages.
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I have written down sentences containing formal objects and real objects. Are they all grammatical? Would you correct some errors? Thank you.
1. OK; would be better if the main verb were in present tense.
2. Would be OK if the main verb were in present tense.
3. OK
4. Awkward, but not incorrect.
5. OK
6. OK
7. OK
8. OK
Seems good as far as I can tell
1. I found it convenient to drive a car. (grammatically correct)
2. I found it convenient that I drive a car. (grammatically correct)
3. I make it a rule to get up at six. (grammatically correct)
4. I make it a rule that I get up at six. (grammatically correct)
5. I believe it useful to buy things on the Internet. (incorrect, should be "I believe it is useful to buy things on the Internet.")
6. I believe it useful that we buy things on the Internet. (grammatically correct but awkward, it would be better to say "I believe that it is useful for us to buy things on the Internet.")
7. I think it useless to try to learn five foreign languages. (grammatically correct)
8. I think it useless that we try to learn five foreign languages. (grammatically correct but awkward, it would be better to say "I think that it is useless for us to try to learn five foreign languages.")
Overall, most of the sentences are grammatically correct, but there are a few errors that can be corrected to improve clarity and readability.