Question

I knew I must tell this man the truth.
(Pick out the modal auxiliary verb and state its function.)​

Answer 1

Answer:

noun clause

Explanation:

must :- ability

Answer 2

In this sentence, the modal auxiliary verb is 'must'.

Explanation:

• Modal auxiliary verb can be used for showing capability, necessity, possibility or willingness. In simpler words, the verbs are full of possibilities.  
• Some of the examples of modal auxiliary verbs are can, could, may, might, must, ought, shall, should, will, would, and so on.
• We can also indicate the modal verbs as negative forms ‘may not, might not, should not, etc’.
• In the given sentence, ‘must’ is the modal auxiliary verb used, as ‘must’ is the form of necessity.  

To know more about modal auxiliary verb,

1) What is modal auxiliary verb?

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2) But I will teach them all to fight for France ( pick out the modal auxiliary verb and State it's function.)​

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