1.Lan/go/mettng/this weekend.
-------------Lan goes meeting this weekend.------------------------
---------------Lan doesn't go meeting this weekend.----------------------
------------------Does Lan go meeting this weekend?-------------------
2. Ba and Tam/play/volleyball/tomorrow.
-----------Ba and Tam will play volleyball tomorrow--------------
-------Ba and Tam won't play volleyball tomorrow--------
-------------will Ba and Tam play volleyball tomorrow?---------------
3. They/collect/old books/poor children.
-----They collect old books for poor children-------------------------
--------They don't collect old books for poor children-----------
-------------Do they collect old books for poor children?--------
4.She/buy/some new clothes/her children.
---------She buys some new clothes for her children-----------
---------She doesn't buy some new clothes for her children----------
------------Does she buy some new clothes for her children?---------