Writeacher, could you please check these sentences? Thanks.

3) It takes him half an hour to drive to school.
4)He has called the wrong number.
5) He paid 300 Euros for his wedding’s suit.
6) I phoned Mary yesterday morning. He started reading his new his new book three days ago.

3. ... wedding suit.

6. delete one of the "his new" instances.

Everything else is fine.

Certainly, I can help you check these sentences. Here are the corrected versions:

3) It takes him half an hour to drive to school.
- This sentence is grammatically correct.

4) He has called the wrong number.
- This sentence is also grammatically correct.

5) He paid 300 Euros for his wedding suit.
- In this sentence, it is more appropriate to remove the possessive 's after wedding. Therefore, it should be written as "He paid 300 Euros for his wedding suit."

6) I phoned Mary yesterday morning. He started reading his new book three days ago.
- In this sentence, there seems to be a mix-up in pronouns. Based on the context, the sentence should be corrected as follows: "I phoned Mary yesterday morning. She started reading her new book three days ago."

To check sentences in the future, it is helpful to carefully review the grammar, punctuation, and clarity of each sentence. Additionally, it can be useful to read the sentence aloud to identify any potential errors or awkward phrasing.