Question

3)Which sentence shows the correct verb mood usage?

We were being in the grocery store.
My mom recommends that he get a cart before going in.
Go telling your friend to get a cart from the front of the store.
If you wanted the better deal, you should be arriving when the store opens.

Answer 1

The sentence that shows the correct verb mood usage is My mom recommends that he (should) get a cart before going in.
In 1) it should be - we were in the grocery store
In 3) it should be - go tell 
In 4) it should be - you should have arrived when the store opened

Answer 2

The sentence that shows the correct verb mood usage is 'My mom recommends that he get a cart before going in.' The rest of the sentences does not show the correct verb mood.