"sempre esta a chover" ? Isn't that correct too?
Yes, in Portugal.
what about> está chovendo sempre
I wrote "está chovendo sempre" but Duo said it was wrong and gave "È chove sempre". Just puzzled because i expected all exercises to have a gerund in them.
And from a previous comment it seems that "Èsta chovendo sempre" should be right, no?
Yes, it is right, but "É chove sempre" is not.
If it is always raining wouldn't we say "'é sempre chovendo"?
Nop. When we have "Present Continuous", we form that using estar+gerund no matter how many times the action has been practiced ;)
I wrote Esta chovendo sempre, and it was marked wrong. Why?
This is not the most common order, but also right.
why can't you omit the está like you can with eu, ele, eles etc?
Verbs aren't usually omitted.