Should, shouldn't, can, could

Killer whales ____________ kill sharks.

I want to be a singer. I _______ sing very well!

Crows __________ use tools like sticks and stones.

Hippos _______ swim.

A: Today is my friend's birthday. What should I bring her? B: Well... you _________ bring her some flowers. (suggestion)

A: I'm really tired. B: You_________ rest for a bit. (advice)

I _________ swim. I will drown in the water!

A: My back hurts. B: You _______ carry a heavy bag. (advice)

A: I don't remember this lesson. B: You __________ do more homework at home! (advice)

Dogs _________ eat chocolate.

Octopuses _____ change their skin color.

Snakes _________ see well with their eyes.

A: I'm worried about my exam. B: You ________ study a little more. (advice)

A: It's raining realy hard outside. B: You __________ go out right now, or else you'll get really wet! (advice)

Cats ________ climb trees.