1. Enjoy the weekends too, have a nice weekend too, have a great weekend too, have a joyful weekend too, chill out over a weekend too, chill this weekend too, I wish you a great weekend too, have a relaxed weeked too, let this weekend be grateful, have an enjoyable weekend too, hope you have a relaxing weekend, have fun filled weekend too и т.д., очень много выражений по этому поводу
2. Magnificent, lovely, great, brilliant, excellent, marvellous, perfectly well, cool, awesome, pretty good etc.
3. I'm not feeling so well. I've got a headache.
I can't recall to memory / I can't remember
It turned to be so easy
I'm in a good mood today, I have a nice temper today, I feel great today, I'm in a good humor today
What are you doing these weekends? What r u gonna do these weekends? What are you up to these days?
I need to take a rest for 1 mn, I have to take a rest for 1 mn, I need to have a minute's repose, I have to repose myself for 'bout 1 mn
4. How about yourself? How's it going? What's up? Wassup? How's tricks? How's it hanging? How are things? How are u keeping? How is it cooking? What's the crack? How' r u goin'? How's life? What's happening?
Именно за время проживания в Англии научилась этой разговорной лексике, если не сказать даже, что сленгу) используйте на здоровье!