Yes, you would say that.
No. The correct formulation would be "Where are you going skiing?"
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This is not correct grammar. The correct way to say this would be "Unless we hurry, we will be late for the show." You would not say anything if you were not going to be late.
My spelling and grammar are excellent. The subject--spelling and grammar--is plural and therefore takes a plural verb. An easy "ear test" is to substitute simpler words. You would say, "It is excellent." You would also say, "They are excellent." Saying "spelling and grammar" is like saying "they" in this context.
Yes, it is correct grammar to say "Would you be so kind as to [do something]?" It is considered somewhat formal.
You have to take a test to get in so say you wanted to get into a grammar in year 8 then you would take an 12+
Based on the poor grammar in your question, I would say you have few to no strengths--and nothing but weaknesses.
No, The correct grammar for this sentence would be, "He finished doing his homework."
To say "learn" in Portuguese, you would say "aprender."
vas a=your going to, aprender hoy=learn today vas a aprender hoy
This should say, The next stop will be somewhere in Vasayas, then it will be correct grammar. Written as it is it is not on correct grammar.