⑧ Singaporeans seem to have emphasized on material gains.

⑨ In our education system, we stress upon examination results.

⑩ World leaders spent a lot of time discussing about worsening economic problems.

显然的，这三句里的介词“on/upon”和“about”是多余的，不必要的。

下面是些类似的错误：

● The young must obey to their elders.

● Do not approach to that odd-looking man.

● The audience attacked on the rude speaker.

● Nothing can escape from his parents' eyes.

● Do you hope to serve for your nation?

● When did Susan marry with Paul?

介词“to, on, from, for, with”都要去掉才对。

为什么会有这些错误呢?主因是分不清楚及物动词和不及物动词的性质。其次，就是对同一个动词及其名词的句型有些混淆。解决之道有二。

第一，要把“及物动词+宾语”和“不及物动词+介词+宾语”划分清楚，如：

I did not answer him./ I did not reply to him.

He reached Londan yesterday./ He arrived in London yesterday.

第二，把及物动词转化为名词，然后加上适当的介词和宾语，如：

Don't approach such a person.

Is oral practice a good approach to language teaching?