My little sister“ has cut ”her fingernails using a clipper . Why can't I use she “is cutting” her fingernails in the sentence? why can't I use continuous tense instead of perfect tense?​

"has cut" is past tense and "is cutting" is present

Explanation: If it is currently happening then you should use is cutting.

When you say my sister has cut her nails using a clipper, it indicates that the action has already finished. The action has finished in the recent past, which means not too long ago she cut her nails.

But, when you say she is cutting her nails, it means the action is not over yet. The action is still going on, she is still cutting her nails and hasn't finished it yet.

This is the difference between present perfect and present continuous tense.

Hope this helps.

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