Existential construction的用法和樣例：
例句
- In existential sentences, location and time phrase before MV or BV verb can be viewed as the subject, no matter whether it has semantic choice relation with the verb.
存現句中，不論是一價(jià)動(dòng)詞前還是二價(jià)動(dòng)詞前的處所和時(shí)間詞語(yǔ)，也不論其與動(dòng)詞是否具有語(yǔ)義上的選擇關(guān)系，都可以看成主題。
