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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the president was the speaker and it was a great part of history.

explanation:

video of the national aeronautic space administration's (nasa) coverage of president john f. kennedy’s address at rice university, houston, texas, concerning the nation's efforts in space exploration. in his speech the president discusses the necessity for the united states to become an international leader in space exploration and famously states, "we choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard."

a-he encouraged islamic schools to introduce greek texts.

d-he invited greek scholars to teach their texts to the locals.

explanation:

the transmission of the greek classics to latin western europe during the middle ages was a key factor in the development of intellectual life in western europe.[1] interest in greek texts and their availability was scarce in the latin west during the earlier middle ages, but as traffic to the east increased so did western scholarship.

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