Tsz Long Ng said: I just want to know when to use start +ing and +to infinitive Click to expand... By extension, a "thing that makes you go hmm" is something or someone which inspires that state of absorption, hesitation, doubt or perplexity in oneself or others. But what if https://youtu.be/T0zWXvhEQwo?si=wNc6ihu97ShtIl7u