1.  At and About

Note that the sentence, "I shall expect you at about five o'clock" is wrong. It should rather be "I shall expect you about five o'clock". 

Reason: 
"At" applies a definite time, and "about" applies to an approximate time. So, using at about is juxtaposition of two unlikes, and should be avoided. You can only say: "I shall expect you at or about five o'clock".

 2. Try And

Many a time, people use "try and" when they actually mean "try to". Logically, if you "try and do something", you  have to first of all try,  which is to make a general attempt, and finding out how do. After trying and finding how to do, you then do it. Thus, there are two actions involve, to try and to do.

On the other hand, "try to" implies the single combination of trying and doing. So, learn not to confuse the two today. 

 3.  All Right

Note that, while already, almost, almighty and altogether, are right, it is wrong to say "alright". However, there is no reason for this. But if you want your grammar to be absolutely correct, you must use "all right".


 4. Misuse of That

It is quite pathetic that most people use the word "That" as an emphatic adverb.

Examples:

"I had no idea the house was that small"

"If the weather is that bad, you had better stay at home"

This use of "That" is wrong and should be avoided. The correct forms of the above sentences are:

"I had no idea that the house was as small as that".

"If the weather is as bad as that, you had better stay at home".


 5.  Ought To

Note that the construction " He ought to, didn't he?" is very wrong. Its correct form is "He ought to, oughtn't he?".

I know this sound absurd. But no doubt, it is the correct form. 

 6. Parallel With

It should be noted that two lines can not be "parallel to". They can only be "parallel with" each other. So, don't say parallel to from today hence forth.


 7.  Averse To

Sometimes, people say they are "averse to". Meaning that they dislike. However, this is very wrong. You cannot be averse to anything, because the suffix "to" signify approach, when the opposite is intended. 

The correct form of "being averse to something" is "being averse from".

 8. Moot Point

Note that the word "moot" does not mean the same as "mute". While the word mute simply mean silence, moot is an Anglo-Saxon town assembly, or court of justice which was a moot or mote, while the meaning place was the moot hall. 

9. USE TO

When people make sentences like "He used to live in Lagos" meaning he formerly lived in Lagos, it is quite understood and correct.

But where they say this negatively or in past tense, they make mistakes. Examples:

"He didn't use to live in Lagos".

"Did he use to live in Lagos?".


The correct forms of the above are:

"He use not to live in Lagos".

"Used he to live in Lagos".


Reason: 
"Used to" is a peculiar idiom itself, and there is no point making its variation even more peculiar.

 10. Xmas

The only reason why the word "Xmas" can be tolerated is because, "X" was a Greek word for Jesus Christ. Writers who intentionally use "Xmas" having be said to be merely lazy. The most formal form is "Christmas"


Source:
https://www.learnersinfo.com/2018/04/wrong-grammers-nigerians-always-use.html?m=0

English language is too complicated. These days is all about wat u can offer, how good u are at wat u do, u don't necessarily need to speak good English to be successful, a little ability to read, write, and communicate in English can take u far. The hustle dis days does not need too much good and correct English all the time.

Think smart, work smart ur hustle will surely pay with or without correct English.

There is no such thing as ”top” grammatical errors.
An error is an error, no error should be termed ”top”
If you always make mistakes with respect to these ones you've mentioned it's simply because it is your personal problem.

English

Nice one bro

OP you are 99.9% correct

Number 5 is onpoint.

Yemi ought to otu sweet

Oughtn't it?

OP, please be careful where you use this kind English make person no vex,arrange for you, tear rubber slap

SamySamy123:
 


 5.  Ought To

Note that the construction " He ought to, didn't he?" is very wrong. Its correct form is "He ought to, oughtn't he?".

If you use the correct forms, people will look at you as if you've freshly run mad

SamySamy123:
 


9. USE TO

"He didn't use to live in Lagos".

"Did he use to live in Lagos?".


The correct forms of the above are:

"He use not to live in Lagos".

"Used he to live in Lagos".

OK

Dayuuuuum! Guilty on almost all counts

I comment my reserve

even u that is doing the correction is a victim of the wrong use of words, we learn every day sha. I hope I DIDN'T DEY HOUSE is a correct English, please teach me

I ought to comment, oughtn't I?

Very informative

We ought to go, oughtn't we?

We ought to read and understand this, oughtn't we
Your audience go think say na Huffington you dey talk

ok

where's grammarnazi

Thanks

good

That No. 5 sounds igboic

wwwtortoise:

Number 5 is onpoint.
Yemi ought to otu sweet
Oughtn't it?

hahahahahahahahahahahahahahahahaha aturu ofia

If not for posts like these, you go just dey talk rubbish dey feel like say you don master English. Thanks OP

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OP trying to correct us but making errors too
point 6, it is not from today henceforth, it is either from today on or henceforth