This development, coming as it did when the bottom had fallen out of the European economy, provided an impetus to a long-held desire to secure direct relations with the East by establishing a sea trade.
What does the bottom had fallen out of the European economy mean?
And what does did in ...
Yes, you can. It's correct, you should not repeat it. Generally, if you use a noun/pronoun in a compound sentence, you don't need to use it again unless the noun in subject changes.
I would say the better way is:
I thought that can't do it alone ...
You can repeat it but you don't need it.
First, since 'thought' is past tense, you must have agreement with 'can't'. I've changed the sentence as follows:
I thought that I couldn't do it alone.
Removing the second I will invariably change the meaning. At the moment the sentence means that you in particular cannot do this task. Ma...
Really? Is the version with "can" really ungrammatical?
Catija: It's wrong. Jim: It's quite unnatural, odd, nonstandard, unfelicitous, but I'm lacking confidence in the philosophical sense, that we can authoratively declare it not correct.
@JimReynolds Though, you'll note that I was more hedgy in my comment on the site...
@DEAD It's pretty odd sounding to me with "can't"... You could certainly use a direct quote to use "can't"... I thought, "I can't do this alone"... — Catija19 mins ago
@JimReynolds I think that does work only in the case of @Araucaria
Totally irrelevant to meaning. With human head nouns, it is a free between wh-relatives and that-relatives: "the person who did it" and "the person that did it" show no semantic or syntactic differences. — BillJ10 mins ago
Long time ago, I read that using "that" is more formal