Most difficult aspects of learning English grammar?

[nq:1]Just wondered what is considered to be the most difficult aspects of learning English grammar? (From a a non-English speaker p.o.v.)[/nq]
In my experience of assisting EFLers, I would say it's a competition between:

1. Use of articles (more so if their L1 doesn't use them).
2. When and where to use our verb "tenses" properly.

They seem to be the questions that I get

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[nq:2]Just wondered what is considered to be the most difficult aspects of learning English grammar? (From a a non-English speaker p.o.v.)[/nq]
[nq:1]In my experience of assisting EFLers, I would say it's a competition between: 1. Use of articles (more so if their L1 doesn't use them). 2. When and where to use our verb "tenses" properly.[/nq]
Agreement level = 100%.

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[nq:2]In my experience of assisting EFLers, I would say it's ... 2. When and where to use our verb "tenses" properly.[/nq]
[nq:1]Agreement level = 100%.[/nq]
Yabbut. You left out: choosing the right preposition.

Bob Lieblich
This thread suits me at a T

[nq:1](SNIPPED)[/nq]
[nq:2]In my experience of assisting EFLers, I would say it's ... 2. When and where to use our verb "tenses" properly.[/nq]
[nq:1]Agreement level = 100%.[/nq]
My issues are less with articles, but I'd agree the tenses are still problematic.
I still have issues with phrases such as "John is taller than ".

"I", right? You would say John is taller tham I a

[nq:2](SNIPPED) Agreement level = 100%.[/nq]
[nq:1]My issues are less with articles, but I'd agree the tenses are still problematic. I still have issues with phrases ... would say John is taller tham I am. So why isn't it me? Why isn't the pronoun an object? JOE[/nq]
I don't think this is much of an issue in a descriptionist sense Joe, not for native speakers. John is taller than me is acc

[nq:1]Just wondered what is considered to be the most difficult aspects of learning English grammar? (From a a non-English speaker p.o.v.)[/nq]
Backwards word order, illogical word order.
Read your sentence above. You do not discover your topic until your last word. While reading, you must keep track of all modifiers, including verbs, then apply those to your topic when finally reached.

[nq:2]I still have issues with phrases such as "John is ... isn't it me? Why isn't the pronoun an object? JOE[/nq]
[nq:1]I don't think this is much of an issue in a descriptionist sense Joe, not for native speakers. John is ... pronoun forms for good reason. Most of the rules surrounding I/me/myself are stupid. There, I actually wrote stupid. Ha. Joanne[/nq]
I can accept there being

[nq:2](SNIPPED) Agreement level = 100%.[/nq]
[nq:1]My issues are less with articles, but I'd agree the tenses are still problematic. I still have issues with phrases ... You would say John is taller tham I am. So why isn't it me? Why isn't the pronoun an object?[/nq]
"Than" is a conjunction. It joins two clauses. With "than", the second clause can generally be truncated and still be unders

[nq:1]I still have issues with phrases such as "John is taller than ". "I", right? You would say John is taller tham I am. So why isn't it me? Why isn't the pronoun an object?[/nq]
"I" is formally correct, because "than" has been traditionally held to be a conjunction, here putting "John" and "I" in parallel. The form without "am" is therefore considered elliptical, requiring a subject form to

[nq:1]Just wondered what is considered to be the most difficult aspects of learning English grammar? (From a a non-English speaker p.o.v.)[/nq]
My great-grandmother from Switzerland had a great deal of difficulty learning English. French was her first language and she was fluent in the Romance languages and German and Polish. She could never quite get a handle on English.
One of her beefs