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.

2 answers

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
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