伴随状况

　　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(但其同义词“ 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 Earth's magnetic fields [D] .