Identify the segment in the sentence which contains a grammatical error.

I want you to complete this work by two days.

Parts of the following sentence are given as options. Identify the segment that contains a grammatical error.

No one have ever visited this place before.

Parts of the following sentence are given as options. Identify the segment that contains a grammatical error.

A large amount of money he invested were wasted.

Parts of the following sentence are given as options. Identify the segment that contains a grammatical error.

A confluence is a place when two or more rivers meet.

Parts of the following sentence are given as options. Identify the segment that contains a grammatical error.

The reason for visiting Meerut was because my mother needed to be looked after.

Parts of the following sentence are given as options. Identify the segment that contains a grammatical error.

She has been working with me on this project from two years.

The following sentence has been split into four segments. Identify the segment that contains a grammatical error.
 He used to reply / that the only place / for which he went / was the town library.

Select the option that contains a grammatical error in the underlined portion.
 It would be impossible for them to continue living in this world if each of them knew exactly what fate had it store for them.