Helping verbs and main verbs

They are singing for his birthday. Type of verb highlighted?

The jellyfish can sting you, causing pain. Type of verb highlighted?

Cookie monster will eat lots of cookies. Type of highlighted verb?

Cows have eaten all the grass. Type of verb highlighted?

Main verb in: 'The small duck will quack when it sees its mother.'

Helping verb in: 'He had waited for the perfect opportunity.'

Helping verb in: 'I will go to watch the game next week.'

Helping and main verb in: 'The band is rehearsing every day.'

Helping and main verb in: 'The students will get their tickets tomorrow.'

Helping and main verb in: 'They are eating fruit and cereal for breakfast.'