Answer:
1 have been playing
2 has been learning
3 have been standing
4 has been living
5 has been working
Explanation:
Present Perfect Continuous verb forms express the idea that
an action started at some time in the past (so use "been" past participle of be) and
continues (use the present participle of the main verb by adding -ing to the given verb)
until the present time (use present tense forms of "have"--note: only 3rd person singular subjects require the "has" form in present tense)
Two things to remember:
All verbs have present participles that end in -ing.
in Present Tense, Third person Singular subjects need to have verb that ends in -s.
