畅想一下20年后科技会有哪些发展，我们的生活会有什么变化，再写一写。
There have been many changes over the past twenty years.
Twenty years ago, .
Now .
There have been many changes over the past twenty years.
Twenty years ago, .
Now .
答案：Twenty years ago, people didn't have smart phones, most people went to work by bike or by bus.
Now we have smart phones and 5G, we can take shared bikes or taxis to go anywhere very easily.
In 20 years, every family will have a super smart robot at home.
The robot can cook meals, clean rooms and look after old people for us.
We will take small flying cars to go out, and we will never meet traffic jams.
Students will have classes with AI teachers at home, and they don't need to carry heavy school bags any more.
Now we have smart phones and 5G, we can take shared bikes or taxis to go anywhere very easily.
In 20 years, every family will have a super smart robot at home.
The robot can cook meals, clean rooms and look after old people for us.
We will take small flying cars to go out, and we will never meet traffic jams.
Students will have classes with AI teachers at home, and they don't need to carry heavy school bags any more.
解析：
这道题考查一般过去时、一般现在时和一般将来时的综合运用，需要结合生活实际对比20年前、当下的生活差异，再畅想20年后的科技发展与生活变化，使用六年级已掌握的基础词汇和对应时态句式即可完成作答。
二、任选一个方面，说一说科技发展给你带来的变化。
答案：参考示例（选取通讯角度）：
In the past, my family could only use the fixed telephone at home to talk to faraway relatives. If we went outside, it was not easy for us to contact others quickly.
Now we have smartphones. We can call and even see our friends and relatives anytime and anywhere. We can also look up learning information, take photos and watch interesting videos on the phone very conveniently.
In the past, my family could only use the fixed telephone at home to talk to faraway relatives. If we went outside, it was not easy for us to contact others quickly.
Now we have smartphones. We can call and even see our friends and relatives anytime and anywhere. We can also look up learning information, take photos and watch interesting videos on the phone very conveniently.
解析：
这是一道开放性情景表达题，要求选取生活里的一个具体角度，用提示的"In the past"描述过去的相关情况，用"Now"描述当下科技发展带来的改变，用词符合六年级英语的知识范围，选择自己熟悉的日常场景（比如通讯、出行、学习等）表述即可。