同学你好，该知识点来自沪江网校《6招冲刺高考英语写作【随到随学班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学好：
Actually, the catastrophe started about four months ago.
“段时间+ago” 表示“... 以前”，用在一般过去时里作时间状语。
But what's worse, the area of ground surface that has been destroyed this time is twice as large as that was last year.
this time 的顺序调换一下更好；用that 指代同名异物的比较对象；was 与last year 一致。
I'm very shocked to hear that because it means 【there are】 thousands of buildings and fields changed into ashes.
there are 是多余的，删去。changed 是谓语，和are 之间的逻辑不通。
A farmer with his cows, the number of which is over one thousand, didn't know where to go.
如果前面用took，和后面的didn't know 逻辑冲突；定语从句的引导部分改一下，whose amont 不准确。
The fire destroyed everything he saw,including buildings,money,forests,and lives, too.
also 用在实义动词前面，非实义动词后面。
The air is full of dust and the sky has turned red because of the flame.
flame 可以表示“火光”，一般不说fire light。
No one knows how long it will last.
宾语从句用陈述语序。

供参考～

祝学习愉快！