Remeber to put a period / full stop at the end of all sentences. When I saw him, I felt happy GOOD When seeing him, I felt happy OKAY, but not very natural. When I'm unhappy, I don’t feel like talking GOOD When unhappy, I don’t feel like talking GOOD, not as natural as the first one. When I have money, I will buy a new watch GOOD When having money, I will buy a new watch VERY ODD, I think it may actually be incorrect. While I was in Beijing, I had a good time GOOD While in Beijing, I had a good time GOOD If I'm tired, I’m going to take a rest GOOD If tired, I’m going to take a rest GOOD If I have car, I’m taking a road trip GOOD but you need A car. If having car, I’m taking a road trip VERY ODD, possibly incorrect. Are these correct?

All twelve sentences are grammatically correct. However, two of them, the ones that use "having", sound strange and probably do not mean what you think they mean. #2: "while" is better than "when" #6: "while" is better than "when". Better still: just eliminate "when". #9 & #10: both ok. better to say: "If (or when) I become tired,..." #11 & #12: better to say "a car" or "the car". It is not wrong to say "if I have car", but it has an odd and special meaning. "Car", used without an article refers to the concept of a car, rather than a car itself. It's better to avoid this unless you are confident that you understand its meaning. #12: I struggle to imagine what it means to be "having car". Given enough time, I could probably invent a story in which this sentence made sense, but it would be a challenge.

The first sentences are more acurate🤙🏼🎩