Left alone, he wouldn't feel lonely.
These are test question candidates for a high school midterm, so could you check if all the interpretations are correct?
In 1, is "even if" or "if" better? I think "even if" is better. In 2, Is "when" or "since" better?
I think this can depend on cotext, and one firm answer given by the test-maker would be silly.
1. Left alone, he wouldn't feel lonely. = Even if(or If) he were left alone, he wouldn't feel lonely.
2. Left alone, he felt lonely. = When(or As=Since=Because) he was left alone, he felt lonely.
3. Left alone, he will cry.= If he is left alone, he will cry.
Re: Left alone, he wouldn't feel lonely.
Yes, in all cases, it would be better to add the other words.
Originally Posted by keannu
For 1. 'even if' is better, because 'if' could imply that he is feeling lonely now because people won't leave him alone.
In 2. the extra words give different meanings to the sentence, so if they're relevant, use them.