[Grammar] Tend to be verb+ing,Seem to be verb+ing

[language2014.2014]

Please let me know why the writers have mentioned "tend to be learning" and "seem to be having" rather that "tend to learn" and "seem to have" in the following sentences:

Students of English as a foreign language tend to be learning so that they can use English when travelling.

You seem to be having trouble connecting.

 

[Glizdka]

Not a teacher
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I always think of it like this: if it makes sense to use the present continuous, it makes sense to use to+verb-ing.

"Students are learning [change/progress]." → "The tendency is that students are learning." → "Students tend to be learning."
"You're having trouble [at the moment]." → "You seem like you're having trouble." → "You seem to be having trouble."

 

[jutfrank]

Please remember to provide the source of any sentences you ask about.