分类整理后面可以跟to do/doing/sb.do/sb.doing/sb.to do的词

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stop to do sth .stop doing sth
warn to do sth.warn not do sth
like doing sth enjoy doing sth love doing sth
help sb to do sth help sb not do sth
finished to do sth
give sb sth give sth to sb
learn sth from sb
buy sth to sb buy sb sth