What about these sentences:lunarpower wrote:in general,
1 * if you have than/as + subject + FORM OF "TO BE" as the second half of a comparison, then you must have another form of "to be" in the first half of the comparison.
2 * if you have than/as + subject + HELPING VERB as the second half of a comparison, then you must have the SAME helping verb (perhaps in a different tense) in the first half of the comparison.
3 * if you have than/as + subject + FORM OF "TO DO" as the second half of a comparison, then you must have an ACTION VERB (or another form of "to do") in the first half of the comparison.
here are some examples:
#1
see the post directly above this one.
also
parking spots are disappearing much more quickly today than they were yesterday.
#2
james can negotiate with salespeople more effectively than stephanie can.
i can run much faster than i could before my most recent knee operation. (note that "could" is the past tense of "can", so these are the same helping verb.)
#3
parking spots disappeared much faster today than they did yesterday.
tanya eats more slowly than she did when she was a teenager. (note that "did" doesn't have to have the same tense as the action verb)
The economy of china grew faster in the year 1990 than in the year 2000.
The economy of china grew at the same rate in the year 1990 as in the year 2000.
are these constructions OKAY?