1 and 2 are okay and have the same meaning. However, in this context 1 is preferable. 2, in this context, would be better said as: She could live long enough to see her son's marriage.
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I didn't know, I would rather have indicated she had illness until now.
1. The use of present perfect gives the idea that her disease is in remission.
4. Use "soon." It is more natural.
5. A full stop means the end of a sen
AnonymousWhile, "I could not join you." means I was not able to join you (at some time in the past)If it is qualified by an "if" clause, you can use "could not" for future. But it means impossibility: