Write these sentences again, using the word or phrase in brackets.

【翻译】用括号中的单词或短语，再写一遍这些句子。

using the word or phrase in brackets，是在现在分词短语，作“方式状语”，说明Write的方式。

为了理解方便，我们可以在using之前加上表示“方式”的介词by，意思保持不变：

Write these sentences again by using the word or phrase in brackets.

现在分词可以作方式状语，“by + 动名词”也可以用作方式状语。因此，在不改变句子意义的情况下，增添或减少介词便可以作为区分动名词和现在分词的标志。有介词是动名词；没有介词是现在分词。请比较：

Using his hybrid rice, farmers are producing harvests twice as large as before. 通过使用他的杂交稻种，农民现在生产的粮食是以前的两倍。（using是现在分词）

By Using his hybrid rice, farmers are producing harvests twice as large as before. （using是动名词）

They also express their feelings using unspoken language through keeping physical distance, actions or posture. 他们还通过使用无声语言，借助保持距离、动作和姿势，来表达感情。（using是现在分词）

They also express their feelings by using unspoken language through keeping physical distance, actions or posture.（using是动名词）

He must be able to use the foreign language, forgetting all about his own. 他一定要做到使用外语时，忘掉本族语。（forgetting是现在分词）

He must be able to use the foreign language by forgetting all about his own. （forgetting是动名词）

She caught cold by sitting on the grass.

She caught cold sitting on the grass.

鉴于上述分析，原句不可改为：Write these sentences again, and use the word or phrase in brackets.——这是“并列关系”，而且write 在先，use 在后，不合逻辑。