suggest 不用 受詞 + to V。可改用動名詞作受詞，或用 suggest that 主詞（should）動詞原形。
✗
They practiced to speak English.
✓
They practiced speaking English.
practice 後接 V-ing，表示練習某技能。
✗
I mind to wait for five minutes.
✓
I mind waiting for five minutes.
mind 後接 V-ing；若是否定常用 don't mind + V-ing 表示不介意。
✗
He stopped to play games at night.
✓
He stopped playing games at night.
表達『不再玩（停止該活動）』用 stop + V-ing；stop + to V 是『停下來去做另一件事』。
✗
She kept practice the piano.
✓
She kept practicing the piano.
keep 後接 V-ing；practice 需改為 practicing。
相似文法比較
vs. 不定詞當受詞
許多動詞（want/need/plan/decide/hope/learn 等）後面用 to V 當受詞；而 enjoy/finish/avoid/keep/mind/practice/suggest/dislike 等後面用 V-ing。部分動詞（like/love/start/begin/prefer）兩者皆可，V-ing 較偏一般習慣或興趣，to V 較偏一次性的選擇或計畫。