Explanation

The modal verb "can" expresses the ability to do something.

In the sentence, "They can fix the problem" means they are able to fix it.

Explanation

Helping verbs or auxiliary verbs such as will, shall, may, might, can, could, must, ought to, should, would, used to, need.

"Should" is a modal helping verb that helps the main verb "waste" express advice or obligation.

Helping (or auxiliary) verbs assist the main verb in conveying tense, mood, or voice.

Explanation

The words like shall, should, ought to, will, would, must etc. are called Modal Verbs.

Modal verbs express necessity, possibility, or obligation.

"ought to" indicates a recommendation or obligation.

Explanation

Is, am, are, was and were are examples of Auxiliary verbs.

In the sentence "I am playing football," the word "am" is an auxiliary verb (also known as a helping verb), which helps form the present continuous tense.

The main verb here is "playing."

Explanation

Laugh is an intransitive verb and does not take any object.

Laughed is the second and third form of Laugh.