Thanks for your correction,
1- Yes, forgotten
important in that sentence.
2- I said "a good topic with a better subject" I mean that the subject of the topic [talking about knowledge] is better than what was going on in this topic [Our Speaking English].
Dear
chaser, I think you've drowned in Formal Structure and Literary Grammar
Yes, according to Formal Grammar many sentences are incorrect but in conversation everything is different...
One day one of my students said to me:
Professor! you said we must use adverbs after Subject and before main verb, like this sentence:
I usually go to stadium on Fridays...
- Yes, that's right, I said.
He said he was watching a movie and the guy in that movie has said (for example) :
Usually I go to church every Sundays.
I said no need to zoom in on Grammatical Structures, it's like our conversation, both of these sentences are correct:
من معمولاً یکشنبهها به کلیسا میروم
معمولاً من یکشنبهها به کلیسا میروم
Hope to get my point.
Yes, in dictionaries and in Grammar Books it is said that "have to" is used when there are no ways except what you mean and what you say. but who cares?!
These days it has completely changed its usage. In almost every sentences you hear "we haf to do this, we haf to do that..." (Haf = Have in conversation)
For example, look at this example from Collins Dictionary:
We'll have to find a taxi.
It doesn't mean if we found a BUS we shouldn't take it
According to you, it should have been:
We should, or, we are supposed to...
But definitely all of them is correct
Look at these examples in Persian:
ما باید یه تاکسی گیر بیاریم
ما مجبوریم یه تاکسی بگیریم
ما یه تاکسی میگیرم و بعد...
All of these sentences have the same meaning...
People are different and they use different sentences to imply their point
Of course your notes are worth a lot and I'm really appreciated them
Thanks a lot
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Discuss + something
مثلا اشتباه شما در استفاده از The , a.an به عنوان شناسه باعث کج فهمی و سر درگمی میشه! اما در جملات 
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