I'm not a qualified teacher, but I hope this can be of some help.Please correct these sentences
1.Hope both of you are doing fine.
Hope you both are doing fine.
These 2 are fine, but they require a subject. "I hope both of you...."
2.How did u come?(For this question,if I reply either of the two sentences below ,Are these sentences correct?)
I came by walking.
I came on foot.
Firstly, "how did you get here? or "how did you arrive?" would be the best ways to ask the question.
I think the 2 answers are fine, but you could also just use "I walked".
3.It was easy for her to solve the problem.
It was easier for her to solve the problem
Both grammatically correct, yet they both have different meanings.
The first simply explains that it was easy for her to solve the problem, but the second uses the comparitive form of "easy" - suggesting, for instance, that it was easy for her, but perhaps not so easy for someone else. Or that she found it easy this time, unlike the time before.
4.Do you both have any plan to come to Dubai?
It should be "plans", not "plan".
You could also say "Are you both planning to visit Dubai?" or "Do you plan to come to Dubai?".
5.There was no news from(about) you for a long time.OR Havenít heard of you for a long time .Where were you?
"I/we received no news about you for a long time" (News relating to the person from someone else.)
"I/we received no news from you for a long time". (News from the person.)
"I/we haven't heard anything from you for ages/for a long time."
Student or Learner