In spotting error verbal ability questions, there will be a sentence broken into two or more parts. The will be an error in the sentence, which you are required to find out. The questions can be asked in different ways, but the concept remains the same.
We use ‘will have’ when we are looking back from the present (a point in time) when something will have happened, e.g., by the end of this year, the scientists will have discovered a vaccine for swine flu.
I will phone at five o’clock. He will have got home by then. ‘Would have’ is used as the past tense form of will have, e.g., I phoned at five o’ clock. I knew she would have got home by then.
We also use ‘would have’ in past conditionals to talk about something that did not happen, e.g., if it had been a summer season we would have gone for swimming. So ‘will’ should be replaced with ‘would’: If Tom had known it yesterday he would have helped him.
5) While flying over (1) India we had (2) glimpses of (3) Himalayas and Ganges. (4) No error (5)
The definite article ‘the’ is used before the names of seas, rivers, lakes, etc., and before the names of mountain groups. So, add the article ‘the’ before ‘Himalayas’ and ‘Ganges’.
6) Doctors can’t treat (1) this complicated disease (2) unless full medical equipment (3) are not given to them (4). No error (5)
