5. The lawn needs to be trimmed regularly.
草地需要定期修剪。
还能这样说：
The lawn needs a regular trim.
You need to trim the lawn regularly.
应用解析：
(as) regular as clockwork 极有规律；
regular verbs 规则动词；
regular building 整齐的建筑物
6. I forgot to water the garden yesterday.
昨天我忘记给花园浇水了。
还能这样说：
The garden wasn't watered yesterday because I forgot to do so.
I failed to water the garden yesterday.
应用解析：
Forget about it.
不要介意，算不了什么，不用谢了；随它去吧，别再提了。
7. I love flowers and hence also love growing them.
我爱花，所以也爱养花。
还能这样说：
I love both flowers and planting flowers.
I have a preference for flowers as well as planting them.
应用解析：
bring into flower 使开花；
the national flower 国花；
in (full) flower 开着花；盛开，成就之最高峰；
in the flower of one's life 在年富力强时期；
in the flowers of speech 华丽的词藻
8. Precious flowers can't be easily kept.
珍贵的花草不易养活。
还能这样说：
It is much difficult to grow precious flowers.
Planting precious flowers isn't easy.
应用解析：
precious little money 极少的钱；
take precious good care of sth. 非常细心地照管某物；
a precious fool 大傻瓜；
a precious deal 极度，非常