Thank you, Mike and Raymott, for your comments. We all seem to be in agreement that the (b) sentences, along with four of the COCA examples, are ungrammatical. I find this very interesting, because native speakers do seem prone toward passivizing clauses with "try to" on occasion. When I enter the search terms "was tried to be" into Google books, I get over forty thousand results! And there are, naturally, plenty of results for "is tried to be," "are tried to be," "were tried to be," "be tried to be," "been tried to be," and "being tried to be," as well.
Now, it's true that many of those results are irrelevant. Some involve the legal sense of something's being tried, and others (relatively few, I believe) are like the example that Roman so astutely observed to have a different meaning, the infinitive following
tried being an adjunct of purpose. However, I'd say that the vast majority of the Google-book results for "was tried to be" are genuine cases of passivization of clauses with "try to." So, assuming we're right that such sentences are ungrammatical, we're talking about a widespread type of grammatical error!
You could passivize those sentences in the following way:
1c. His helping her was tried.
2c. Solving the problem was tried by them.
3c. Climbing the mountain has been tried by many people.
These sentences are not elegant (except that 3 sounds OK), but I believe they are all grammatical. So your generalisation that, "... no sentence with "try to" can grammatically be passivized" seems to be wrong.
Very interesting, Raymott. I agree with you that (3c) sounds OK. The other two seem to me to be of questionable acceptability. I think I tend to find such passives to be obviously acceptable mainly in cases where the -ing word is lexically a noun. Take
surfing, for example. I find the sentence
Surfing was tried by all the children to be an obviously acceptable passive of
All the children tried surfing. But I don't think
Surfing was tried by all the children is, syntactically or semantically, a passive of
All the children tried to surf. Consider the difference in meaning:
- I tried to surf, but I kept falling off the board.
- I tried surfing, but I found that it wasn't for me.
Thus I tend to think that
Climbing the mountain has been tried by many people is the passive of
Many people have tried climbing the mountain rather than of
Many people have tried to climb the mountain, and that those two active sentences have subtly different meanings. In informal English, as we know, we sometimes use "try and" in place of "try to." Interestingly, this only seems to work when both "try" and the other verb are in their base forms. (I've actually confirmed that by looking in a couple of grammar books.) I find the following rather amusing:
- We must try and climb the mountain.
- *The mountain must be tried and climbed by us.