The given sentence is grammatically correct and there is no error.
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.
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 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.
The given sentence is grammatically correct and there is no error.
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?.
Error is in second part. Replace ?has? with ?have?. Since ?parents? is in plural form it will be followed by the plural form of has, i.e. ?have?.
Error is in second part. Replace ?have? with ?had?. Since two events are mentioned and both occurred in the past, the even that happened first will be expressed in past perfect tense. Hence ?had conquered? is the correct form.
Error is in third part. Every, each, either, neither are adjectives that are always followed by a singular pronoun. Every being singular takes singular subject. Therefore ?their ideas? should be replaced with? his/her idea?.
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