Giải thích nữa nhé .Cảm ơn

1. I'm understanding biology → "I understand biology" is correct. "Understanding" is typically used for ongoing actions, not for a fact or state.

2. I admit I'm admitting that I don't know much about cars → "I admit" is correct. The present tense is appropriate here, whereas "I'm admitting" suggests a temporary action or ongoing process.

3. Do you find difficult to concentrate on your work with this music on? → "Are you finding" is not appropriate as it suggests an ongoing experience rather than asking about a general capability or situation.

4. We’ll do our best to get the computer repaired by next week, but we don't guarantee it. → "We’re not guaranteeing" implies an ongoing commitment, but here it's more about the promise of doing one's best.

5. I know how difficult it is, I’ll never criticise your driving again. → "I’m knowing" is incorrect as "know" states a fact. It doesn't need a continuous form.

6. I refuse to believe her → "I’m refusing" suggests a temporary or ongoing action, but this opinion is an established viewpoint.

7. I certainly agree with you that people shouldn’t drink and drive. → "I’m certainly agreeing" suggests a temporary agreement rather than a firmly held belief.

8. I’m not apologising for that → "I don't apologise" is a more straightforward statement of fact.

9. We’re considering emigrating to Canada → "We consider" doesn’t convey the current thought process as effectively as the continuous form "are considering".