of ‘was’ in a passive voice. thus, the error is in part 2.
last night, the girl in the blue dress looks the prettiest.
answer: there is an incorrect use of tense in the sentence. since the time frame mentioned is ‘yesterday’, ‘looked’ (past tense) of ‘look’ should be the correct tense to be used in the sentence. thus the error is in option 4.
the actor talked as if she had already receive an award.
answer: here the given sentence is in past form as the words ‘talked’ and ‘had’ are used. so the verb (receive) should also be in past form. so instead of ‘receive’, ‘received’ should be used. so option 3 