1. Clicking ▼&► to (un)fold the tree-labels may facilitate locating what you want to find. 2. All politics-oriented teaching videos on this website are embedded solely for the purpose of English learning. They do not necessarily indicate or represent my personal preferences or political positions. 3. This is just one of my several websites. Please click the category-tags below to go to each independent website.
source: LearnAmericanEnglishOnline 2017年9月25日 English language students can learn how to ask about a person's responsibility by using a helping verb, have to, and the main verb.
