1.在我们通常使用的there be句型中,以下几种表达必定错。(1)there could be done sth.(2)there be sth. done(3)there being 名词词组(4)there was sth. (抽象性表动作的名词),如there was a transmission的表达不对。一般来说gmat中there be仅用于“某处有某物”,而此物是指一具体名词,如wolf,stone, star,而不是指抽象名词:如conversion,relation等。(其中done代表过去分词)
2.在表示某人有某种能力做某事的意思,最佳答案的选择依据是,can do>.be able to>.has(have)ability to do>. has(have)a capability of doing. . .(其中“>.”指“优先于”,有can do就不用含有be able to do的选项,在选项中不含有can do时,再找有be able to的选项,依此类推)。