look
The Italian word 'guarda' can be used as a verb to instruct someone to look at something, it can also be used in a more formal way as 'to watch'. It is used in many contexts similar to how 'look' is used in English.
Watch the sky tonight.
This phrase uses 'guarda' in a command form, informing someone to observe the sky during the evening.
He never watches television.
'Non guarda mai la televisione' is an example of using 'guarda' in present tense, indicating a routine or habitual activity that does not happen in this case.
Look who's coming!
Here, 'guarda' is used in an exclamatory way to draw attention to someone who is arriving.