@ashs , as far as I remember, China uses the term "reasonable period" rather than a fixed number of years as to how long you can avail of the exclusion of the first $5000 from US taxes. All it requires is that you are a student /trainee and NOT be a resident of the USA i.e. temporary presence. The fact that US tax authority looks at you as a resident for tax purposes does NOT negate you immigration status as a temporary residing in the USA under F-1 visa. So in my view you should be able to use the $5000 exclusion in 2020 and 2021, as long as you have not applied for Green Card or similar steps or are no longer a student/researcher/trainee.
Is there more I can do for you ?
