日本語をクリックすると英文が表示されます。まずは自分で英語にしてから答え合わせを。
Health is the most important of all.
You have to（must) study as hard as she does.
How is your grandmother?
The doctor said it'll be necessary to operate.
Your help is necessary to our success.
It is necessary that you see a doctor.
Sleep is necessary for good health.
I'm not feeling well.
I think I caught a cold.
I have a headache.
I might have a fever.
I have a sore throat.