infintiive/gerund form3

my sister practises_playing___________the pino every day.

there is further news,please let me_____know________.

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see explanation as below:-

VERBS + INFINITIVE

These verbs include:
afford, agree, appear, arrange, ask, attempt, care, choose, dare, decide,
deserve, expect, forget, happen, help, hope, learn, manage, offer, pretend,
promise, refuse, seem, threaten, want, wish

eg: I forgot to do the homework yesterday.


VERBS + -ING
These verbs include:
admit, appreciate, avoid, consider, delay, deny, dislike, enjoy, face,
fancy, feel like, finish, forgive, give up, can愒 help, imagine, keep, look forward to,
mind, miss, practise, put off, resist, risk, can愒 stand, suggest, understand

Examples:
Andrew admitted cheating in the exam.
Elena has given up smoking.

VERBS + INFINITIVE or -ING (兩種forms都可以用)

These verbs include:
advise, allow, can愒 bear, begin, continue, forbid, forget, go, hate, intend, like, love, prefer,
remember*, start, stop*, try*

Examples:
I was on my way home when it started to rain = I was on my way home when it started raining
* with a change in meaning (有* 的詞, 不同form , 意思不同)
eg:-
i stopped working--- 我停止了工作.
i stopped to work- 我停下來去工作了.

VERBS + OBJECT + INFINITIVE

These verbs include:
advise, allow, ask, cause, encourage, expect, forbid, force, get, hate, help, invite,
leave, like, love, mean, need, order, permit, persuade, prefer, recommend,
remind, teach, tell, want, warn, wish

Examples:
Dennis persuaded me to go on holiday with him.
Can you ask the taxi driver to wait?

hopt it's clear.

my sister practises the piano every day.
practise本身就有練習的意思，而且是及物動詞，所以無需加to，或用動名詞。
如：The young girl practices the violin every day.（那少女每天練習小提琴）
而if there if further news, please let me know
這是因為，let之後要用原形動詞(bare infinitive)。
希望幫到你！