The error is in third part. The adjective hard has two different adverbs, and they express opposite meanings. The adverb hard is used to modify a verb and means that the action is being done very intensely. The adverb hardly is used to modify a verb and means that the action is not being done very intensely. So there the correct usage will be ?working hard?.
The given sentence is grammatically correct and there is no error. ?Memoranda? is a plural noun, so it is correctly followed by are. Memorandum is the singular form.
The error is in second part. ?where was he going? is a question in itself but the given sentence is assertive. So, in the correct form the verb ?was? will follow the pronoun ?he? as, ?where he was going?.
The error is in first part. ?Tell? should be replaced with ?Ask?. Tell is a command whereas Ask is a request and hence more courteous in this case. As this is a request the sentence should start with ?Ask? rather than ?tell?.
The given sentence is grammatically correct and there is no error.
?prefer? is a verb that is always followed by the preposition ?to? expressing choice or preference over something else. In this case choice of ?this book? over the ?other? one. ?Than? is used for comparing to options, ?prefer to? expresses choice. Correct expression will be ?to that one?.
The given sentence is grammatically correct and there is no error.
The error is in first part. Replace ?whom? with ?who?. ?Whom? is a pronoun which is the objective case of the pronoun ?who?. But who is the subject in the given sentence, and hence usage of ?whom? is incorrect here.
Error is in second part. Replace ?grave? with ?graver?. Since problems are being compared in the given sentence we will use the comparative form of ?grave? that is ?graver?.
The error is in third part. Replace ?good? with ?correct?. English is not good or bad, but it can be correct or incorrect. We can also say ?All of them speak English well?, or ?All of them speak fluent English?. The error remains in part c.
The given sentence is grammatically correct and there is no error.
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