and/or

[sitifan]

1. I haven't seen you and Helen for a long time.
2. We can't stop typhoons and earthquakes from happening.
Are the above sentences acceptable?

[Raymott]

1. I haven't seen you and Helen for a long time.
2. We can't stop typhoons and earthquakes from happening.
Are the above sentences acceptable?

Yes, they're OK. The first would be more common if you usually see "you" and Helen together, eg. if they are a couple.
For 2. either 'and' or 'or' is possible; no one's going to nitpick that.