Reply to "tense"

ruifeng posted:

1. How many nouns did I write?

2. How many nouns have I written?

Which one is correct or more natural?

Hi, Ruifeng: Both (1) and (2) are correct and natural.

ruifeng posted:
Is there a difference between American usage and British usage?

BrE speakers tend to use the present perfect more often than AmE speakers do.

ruifeng posted:
And is the word "just" necessary when in a situation like this?

No. "Just" is optional in this context. That the writing (has) just happened will be obvious to the students, who (have) just witnessed the event spoken of.

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