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Bet123 Posted 7 years ago
Grammar
“isn’t verb -ed” vs “hasn’t been -ed
Question:
The cause of mysterious illness ———— yet, so the doctors still can’t put forward any effective course of treatment
A)isn’t identified B)hasn’t been identified
Why should i use “hasn’t been identified” here. Can you help me understand it
Top answer
bet123 Why should I use “hasn’t been identified” here ? yet ~ up until now 'yet' suggests that scientists began trying to find the cause of the mysterious illness some time ago. That's the past.
- bet123 Why should I use “hasn’t been identified” here ?
- yet ~ up until now 'yet' suggests that scientists began trying to find the cause of the mysterious illness some time ago.
- That's the past.
- But at the present moment they haven't found the cause.
- When you have an activity that starts in the past and continues to the present, you have a reason to choose the present perfect tense to express that time relationship.
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1 Answers
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bet123Why should I use “hasn’t been identified” here?
yet ~ up until now
'yet' suggests that scientists began trying to find the cause of the mysterious illness some time ago. That's the past. But at the present moment they haven't found the cause.
When you h
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