Questions using 'so far' might include:
"How much have you learned so far?" the father asked his son.
So far, what have you finished?
So- you are asking when to use 'when' in a sentence. When you are asking how to use when in a question, you are already using when in a sentence, because a question actually is a sentence. I like to use when in a sentence whenever I like.
So far as we know, there is no other life in our solar system.
If you put a question mark after it I think it is.
Look at all that we have gained so far.
You have just done so in the question itself.
"I was going to answer this question but forgot how best to do so"
How can you use the word recede in a sentence?
Care to finish the sentence? As a question so far it makes no sense.
So you think that's a difficult question, do you?
They had been travelling all day and were tired so they decided that this was as far as they would go for the day.
The answer to your question is so obvious that the v is not even required! ;)
Sara delivered aid to the outlying island . You use it as if you are replacing the original word ''outlying'' by '' far '' .. May's aunt lives in a quiet and outlying neighborhood of the city. in this sentence it also means far. So that means if you want to use outlying in a sentence you should think and try to replace it by far, far away, to the far ___ .. which is basically '''far'''