Thisismostlybecauseoftheenergyusedtomanufacture,transportandoperatesuchequipment.分析句子.becauseof后面接名词词组了不是不能接V吗?句中used作动词,那thisismostly在句中作什么成分?而且mostly是副词

Question

This is mostly because of the energy used to manufacture,transport and operate such equipment.
分析句子.because of 后面接名词词组了不是不能接V吗?句中 used 作动词,那this is mostly 在句中作什么成分?而且 mostly 是副词.

Answer 1

this is 在句中作主语和谓语成分,mostly只是个修饰,而used及后面的是对energy的补充说明