Is that your mother爲什麼Is要在that的前面.This is your mother/is在thi

題目：

Is that your mother爲什麼Is要在that的前面.This is your mother/is在this後面?

解答：

Is that your mother?是一個一般疑問句,需要把be動詞提前,或把助動詞do提前
而This is your mother.是一個陳述句,這個是陳述語序