Hi
Are the three sentences below correct as they are?
1. Let me know is it good for you or if have any suggestions.
2. I’ve been following your website since long time.
3. I appreciate the time and really looking forward to working together.
Thanks
Newguest 1. Let me know is it good for you or if have any suggestions. No.
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Newguest1. Let me know is it good for you or if have any suggestions.
No. Change the underlined part to "if it is".
Newguest2. I’ve been following your website since long time.
No. You can say "for a long time". We use since with a point in time (not a duration).
Newguest3.