This is the 94th most frequent Hebrew word.
שהיא
"That she is" or "that it is" (feminine).
In this sentence, 'שהיא' introduces a subordinate clause, serving as a combination of 'ש' (that) and 'היא' (she), connecting the main clause to a statement about the subject.
אני יודע שהיא גרה בעיר.
I know that she lives in the city.
'שהיא' functions as a relative pronoun equivalent to 'which' or 'that', referring to a feminine singular noun 'מכונית' (car) and introducing more information about it.
המכונית שהיא נוסעת בה היא חדשה.
The car that she drives is new.
Here, 'שהיא' introduces an explanatory subordinate clause, connecting it to the expression of feeling in the main clause.