Bài làm:

1. The man who is standing there is a clown.

   • Sửa: The man standing there is a clown.
   • Giải thích: Ta bỏ "who is" để tạo thành cụm danh từ "the man standing there".

2. The envelope which lies on the table has no stamp on it.

   • Sửa: The envelope lying on the table has no stamp on it.
   • Giải thích: Tương tự, ta bỏ "which lies" để tạo thành cụm danh từ "the envelope lying on the table".

3. The students don't know how to do the exercise which were given by the teacher yesterday.

   • Sửa: The students don't know how to do the exercise given by the teacher yesterday.
   • Giải thích: Ta bỏ "which were" để tạo thành cụm danh từ "the exercise given by the teacher yesterday".

4. The diagrams which were made by young Faraday were sent to Sir Humphry Davy at the end of 1812.

   • Sửa: The diagrams made by young Faraday were sent to Sir Humphry Davy at the end of 1812.
   • Giải thích: Tương tự, ta bỏ "which were" để tạo thành cụm danh từ "the diagrams made by young Faraday".

5. All the astronauts who are orbiting the earth in space capsules are weightless.

   • Sửa: All the astronauts orbiting the earth in space capsules are weightless.
   • Giải thích: Ta bỏ "who are" để tạo thành cụm danh từ "all the astronauts orbiting the earth in space capsules".

• The man standing there is a clown.
• The envelope lying on the table has no stamp on it.
• The students don’t know how to do the exercises given by the teacher yesterday.
• The diagrams made by young Faraday were sent to Sir Humphry Davy at the end of 1812.
• All the astronauts orbiting the earth in space capsules are weightless.

1. The man standing there is a clown.
2. The envelope lying on the table has no stamp on it.
3. The students don't know how to do the exercise given by the teacher yesterday.
4. The diagrams made by young Faraday were sent to Sir Humphry Davy at the end of 1812.
5. All the astronauts orbiting the earth in space capsules are weightless.