大家知道，不可數名詞沒有表示複數的“-s”標誌，因此前面不可有數目字，只可以有數量詞，基礎語法：表達數目和數量的特別方法。例如我們可以說①， 不可以說②：
①There is not much furniture in the office.
②There are not many furnitures in the office.
這是不是說不可數名詞就不可數呢？不然。相反的`，不可數名詞也是可數的，主要方法是借重單位詞（unit word），如：
a piece of, a cup of, a drop of, a lump of, a handful of, a flash of, a blade of, a head of, a bar of, an ear of等。
如果數目是超過“一”，就以確實數目取代“一”，中國小英語《基礎語法：表達數目和數量的特別方法》。例如：
two pieces of, three cups of 和 five lumps of 等。
現在試試把上述這類單位詞和適當的不可數名詞連用。
① Mr Li has just bought a piece of new furniture.
② Give me a cup of cold water, please.
③ Please put two lumps of sugar in my coffee.
④ The boy picked up two handfuls of sand from the beach.
⑤ We saw a flash of lightning in the sky.
⑥ The gardener pulled out blades of wild grass from the garden.
⑦ She gave bars of chocolate to the visi
