The Social Democrats could still carry out their threat to leave the government. [VERB PREP. noun (not pronoun)]

社会民主党人仍有可能将其退出政府的威胁付诸实施。

Police say they believe the attacks were carried out by nationalists. [be V-ed P + by]

警方说,他们认为袭击是民族主义分子发动的。

Commitments have been made with very little intention of carrying them out. [VERB noun PREP.]

诺言是许下了,可是基本没有打算真的照办。