Sentence Correction - General Questions

Choose the correct replacement for the part in bold. If no change is needed, choose "No correction required". The children was playing in the garden.

Choose the correct replacement for the part in bold. If no change is needed, choose "No correction required". The price of vegetables have gone up.

Choose the correct replacement for the part in bold. If no change is needed, choose "No correction required". I have seen him yesterday.

Choose the correct replacement for the part in bold. If no change is needed, choose "No correction required". They did not went to school.

Choose the correct replacement for the part in bold. If no change is needed, choose "No correction required". He did not knew the answer.