Leem's homework:
We probably have a lot of redundant things.

-We need to have a medical check up because we don't konw our physical condition exactly.
We may have a cancer, or a pneumonia.
We must prepare and cure our disease before it gets worse.
Or we can check that we are healthy or not.
This is why we have to check our health regularly.

Leem: We need to have a medical check up because we don't konw our physical condition exactly
Correct:  We need to have a medical checkup because we don't konw our physical condition exactly
Explanation: checkup is an example of a compound noun.

Leem:  We may have a cancer, or a pneumonia.
Correct: We may have a Cancer, or Pneumonia.
Explanation: We should capitalize these two words because they're nouns.

Leem: we can check that we are healthy or not.
Correct: we can check if we are healthy or not.
Explanation: If is used to say that something will happen only in the case that something else happens or is true

Comments:
Hi Leem! I'm glad that you are always doing your homework on time. Just don't forget some of my corrections in here and I'll see you again on monday! Keep safe and enjoy your long weekend!