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20 Jul 2020, 09:22
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Kanika3agg
Hi Kanika3agg, I wouldn't necessarily consider as done as a modifier; it is just a separate clause:
We should read the sentence as:
....whether Leonardo da Vinci first sketched the figure in black, as (was) done by many artists of the time.
So, the verb was is implied in the second half of the sentence.
18 Aug 2020, 18:13
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azfarsulaiman1
If you're asking whether it's acceptable to have two parallel clauses that have different verb tenses, the answer is "yes," as long as those verb tenses are logical.
For example:
- The neighbors wondered whether Tim had forgotten to pick up his kids from day care that morning, and, if he had, whether his wife would leave him.
Notice that we have two parallel clauses here, each beginning with "whether," and the verb tense is different in these clauses: "had forgotten" in the first clause, and "would leave" in the second. But the different tenses make perfect sense. Tim's negligent act happened "that morning" and his wife's response would have to happen in the future, after she finds out about her husband's misdeeds. So this sentence is fine.
Similar logic in (C):
- "Art historians are using a process known as infrared scanning in analyzing the Mona Lisa to determine whether it has been altered since completion and whether Leonardo da Vinci first sketched the figure in black."
Again, we have different tenses in the two clauses, "has been altered" in the first, and "sketched" in the second. But the timeframe of the first action is "since completion," so the present perfect makes sense. The Mona Lisa could have been altered hundreds of years ago by some 18th century rogue, but it could also have been altered this morning. However, the second action, "sketched" was performed by Leonardo da Vinci many years ago, so the simple past tense is appropriate.
The takeaway: you never want to turn off your analytical brain when evaluating a sentence. Asking yourself whether the tenses in two clauses are the same isn't helpful. Asking yourself whether the tenses are logical is.
I hope that helps!
15 Mar 2021, 12:14
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Art historians are using a process known as infrared scanning in analyzing the Mona Lisa to determine if it has been altered since completion and if Leonardo da Vinci first sketched the figure in black, as done by many artists of the time.
(A) if it has been altered since completion and if Leonardo da Vinci first sketched the figure in black, as done -> Since gives a hint of "been" to be used. If we have two alternatives, then we need to use "whether". Incorrect.
(B) if it had been altered since completion and if Leonardo da Vinci first sketched the figure in black, a practice employed -> Same as A.
(C) whether it has been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice employed -> Now, "whether" is better to use. Further, tense agreement is in place and last, we have "a practice employed, is a better tense structure. Let's keep it.
(D) whether it was altered since completion and whether Leonardo da Vinci first sketched the figure in black, as was done -> Since gives a hint of "been" to be used. Incorrect.
(E) whether it had been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice done -> a practice done, we do have structural issue in Tense. Incorrect.
So, I think C.
(A) if it has been altered since completion and if Leonardo da Vinci first sketched the figure in black, as done -> Since gives a hint of "been" to be used. If we have two alternatives, then we need to use "whether". Incorrect.
(B) if it had been altered since completion and if Leonardo da Vinci first sketched the figure in black, a practice employed -> Same as A.
(C) whether it has been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice employed -> Now, "whether" is better to use. Further, tense agreement is in place and last, we have "a practice employed, is a better tense structure. Let's keep it.
(D) whether it was altered since completion and whether Leonardo da Vinci first sketched the figure in black, as was done -> Since gives a hint of "been" to be used. Incorrect.
(E) whether it had been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice done -> a practice done, we do have structural issue in Tense. Incorrect.
So, I think C.
