Spotlight

In the English language, the word "teacher" is a noun. For example, Muhammad Ali is a teacher of English.

"Teacher" is used as a title. For example, on someone's business card: "Muhammad Ali, Teacher."

But remember, you can't use it to address a teacher. For example, to use this word in the following way is considered incorrect in English:

• "Teacher, what do we call it?"

To conclude, "teacher" cannot be used as a term of address but as a title.

2) Lemme give you the tip number two, friends! Is it possible for a clause to have two instances of 'even'? We don't usually use two instances of 'even' in a sentence; however, it is possible, though rare, to write two instances of 'even' in a clause:
Not even Ferrari, which everyone is ballyhooing, can even overtake McLaren.✓
3) Here's the tip number three: It may be surprising to your ears, but we use etc. (et cetera) to refer to things and et al. (et alii/alia) after names. English is a beautiful language, innit?

Use “etc.” (et cetera) for things: socks, pencils, keys, etc.

Use “et al.” (et alii) for people: Asad, Ahmad, Shahid, et al.

4) Now the tip number four: Many people think or have been taught that 'whose' can only be used to refer to people and not inanimate objects. But, it's not true. 'Whose'  can also be used to refer to things and objects. For example, I have a truck whose door is broken.✓
5) Sure of vs Sure about

Normally, we say sure of ('Make sure of your facts'; 'l am not sure of his address'), but about is used when the matter in question is something concerning the person or the thing mentioned.
I shall certainly be present at the meeting, but I am not sure about my wife. (i.e. whether she will be present.)
I used to think that I should like to live in a small village, but now I am not sure about it. (i.e. whether I should like it.)
Before we leave the station we had better make sure about the train for the return journey. (i.e. what time it leaves.)