Question

Pick out the main clause and the subordinate clause in the following sentences:

1. Open heart surgery, which can help to repair heart defects, is also performed successfully.

2. They can treat patients of all ages who have suffered a stroke.

Answer 1

1. main clause: Open heart surgery is also performed successfully subordinate clause: which can help to repair heart defects

2. main clause: They can treat patients of all ages. subordinate clause: who have suffered a stroke