I think most non Europeans will feel it is how to use articles (zero, a/an, the) correctly.

paco
I wish I would write it as an option as well. Since I wrote it all at once I couldn t remember it. Thanks for your interest paco2004
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How about modals and semi-modals?
Dear friends please keep writing alternative choices for the poll.If I prepare a new poll about the same question I will add alternatives there. Thanks a lot for your interest
I find prepositions quite hard to deal with. Prepositions following nouns, following verbs, following adjectives. There's almost a special preposition for each word or situation and no rules to stick to!! Sometimes, the differences in meaning and use are so slight that it's difficult to make a point. I think it has to do with the student's native language as well.

Just an opinion...

Regards,

Mara.
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Think of prepositions this way: they are small words joining a noun or a pronoun, and adds meaning to the rest of the sentence. In most cases, they can be though of as places. At, In, For, Around, Within, On, Below, Atop... the list can go on for a long time. If you have a sentence that has a prep phrase in it, put parenthesis around it. If the sentence makes sense without reading what is in the parenthesis, what is in the brackets is a prep phrase. For example:

He sat quietly in the chair.

(in the chair) is a prep phrase. The sentence makes perfect sense being: He sat quietly. In the chair is just modifying where he was sitting.

Hope this helps.