随着情况

在下列表示能力、愿望、倾向等语义的形容词后边也要接不定式：able(但其近义词“ capable”后面要接“of+动名词”),anxious, eager, glad, inclined(倾向于),liable, likely, pleased, ready等。

25) Certain [A] minerals are magnetic and are able to detected [B] by instruments that measure [C] differences in the Earths magnetic fields [D] .