If yesterday, previous day, ago, last night/ years/ month are used in sentence, then helping verb is always in simple past tense.
- I have passed the exam two years ago. (incorrect)
- I passed the exam two years ago. (correct)
If a sentence starts with it’s time /it’s high time, then helping verb is always in simple past tense.
- It’s high time you went to bed. (correct)
When a sentence contains two past actions, there should be a combination of v2 & had + v3. i.e. simple past tense and past perfect tense. Neither two simple past tense nor two past perfect tense should be used.
Now the confusion arises with which sentence we should simple past tense and past perfect tense. It should be noted that the past perfect tense should be used with the action happening first. As in the above example, the train arrived first before we reached, therefore, the past perfect tense should be used with the ‘the train had arrived…’
Sheena told me his name after he left for Delhi. (incorrect)
Sheena told me his name after he had left for Delhi. (correct) [first action:- leaving for Delhi, Second action: Telling his name]
Sheena had told me his name before he left for Delhi. (correct) [first action:- Telling his name, Second action: leaving for Delhi]
A tyre has 3 punctures. The first puncture alone would have made the tyre flat in 9 minutes, the second alone would have done it in 18 minutes, the third alone would have done it in 6 minutes. If the air leaks out at a constant rate, then how long (in minutes) does it take for all the punctures together to make it flat?Watch Solution
Pipes A and B together can fill an empty tank in 30 hours, whereas pipes B and C together can fill it in 24 hours. A, B and C together can fill the tank in 20 hours. In how many hours can pipe B alone fill 35% of the tank?Watch Solution
A is as efficient as B and C together. Working together A and B can complete a work in 36 days and C alone can complete it in 60 days. A and C work together for 10 days, then B alone will complete the remaining work in :Watch Solution
To do a certain work, the ratio of the efficiencies of X and Y is 5 : 4. Working together, they can complete the same work in 10 days. Y alone starts the work and leaves after 5 days. The remaining work will be completed by X alone in:Watch Solution
A and B can do a piece of work in 6 days and 8 days, respectively. With the help of C, they completed the work in 3 days and earned Rs. 1848. What was the share of C ?Watch Solution