一些小文法^^ - 英檢

我想要請問一下 一些小小的文法

1.有關於動詞的否定

although the number of reported volcanic eruptions has risen exponentially

since 1850,this indicates not increasing volcanic activity but rather more
~~~~~~~~~~~~~~~~~~~~~~~~
widespread and systematic record keeping.

我是想請問一下 這樣子是屬於動詞的否定嗎?

是不是可以直接加 not 這樣使用呢^^?

2.there is no need to speak to someone about what is past.
~~~~~~~~~~~~

上句是我在電影裡面看到的 我想請問一下為何不是用 what past is 呢?

或是這只是口語^^?

謝謝



--