有一句英文不太明白So we will need to give them assurances and guarant

有一句英文不太明白So we will need to give them assurances and guarantees that we will stay within the emisson targets.这句话,assurances和guarantees这两个词是动词还是名词?如果是动词,them不应该接第3人称单数啊.如果是名词,保险,保证这种逻辑性的词,怎么会有复数呢?难道是多重保险，多重保证的意思？