1. If you alter the method of learning vocabulary, you can enhance your English.
2. Robert proposed collecting those empty bottles for recycling.
3. Tom's inability to achieve good grades at school is due to his laziness.
4. Michael enjoys playing football after school.

1. If you change the way you learn vocabulary, you can improve your English.

   Lý do : Câu điều kiện loại 1: If + Simple Present, Subject + will/won't + Verb.

 2. Robert suggested that those empty bottles should be collected for recycling.

   Lý do: Suggest + that-clause (Suggest + mệnh đề “that”)

 3. Tom is very lazy so he can't get good marks at school. 

 4. Michael is fond of playing football after school.

   Lý do: Fond of Ving