you might say you were as busy as a bee if you spent your weekend cleaning your house.

a beehive (蜂巢，拥挤的地方） of activity

has a bee in her bonnet（帽子） .

none of your beeswax (蜂蜡 )

the birds and the bees.（可向儿童说明的）关于两性关系的基本常识

If something was the best of its kind, you might say it was the bee's knees.

If you are really angry, you might say you are mad as a hornet.

If you stir up（激起，挑起） a hornet's nest, you create trouble or problems.

have butterflies in your stomach

have ants in your pants

you might ask him to leave you alone or "stop bugging me."

put a bug in your ear

snug （温暖舒适的） as a bug in a rug（小地毯）sleep tight -- don't let the bed bugs bite.