An auxiliary verb helps the main full verb

An auxiliary verb helps the main (full) verb and is also called a "helping verb." With auxiliary verbs, you can write sentences in different tenses, moods, or voices. Auxiliary verbs are: be, do, have, will, shall, would, should, can, could, may, might, must, ought, etc.

~I think I should study harder to master English.
~I am having a cup of coffee.
~You have been practicing hard.
~It was written by a petitioner.
~You may choose what you like.

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HERE ARE SOME COMMON PHRASAL VERBS IN ENGLISH

~Screw up
When something screws up somebody, it confuses or hurts them.

~Scratch out
To scratch out is to make a living with great difficulty.

~Seal off
To seal off an area is to block it or prevent access to it.

~Set off
To set off is to start a journey.

~Shake off
To shake something off is to get rid of it.

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