In Nouns^x, American English^x, Past tenses^x

1. Use of present perfect tense and simple past tense Speakers of American English generally use the present perfect tense (have/has + past participle) far less than speakers of British English. In spoken American English it is very common to use the simple past tense as an alternative in...

But the word "practise" only exists in British English. If the student is learning American English, only "practice" will do for both noun and verb. My American Heritage Dictionary does not even have an entry for "practise".