在英语中，表示推荐的高级句式可以使用以下几种方式：

1. 虚拟语气：

- It is highly recommended that you (should) do sth.

- It is suggested/advised/ proposed that you (should) do sth.

2. 句型变换：

- I highly recommend that you do sth.

- I strongly advise/suggest/propose that you do sth.

3. 短语表达：

- I cannot recommend it enough.

- You can't go wrong with it.

- I wholeheartedly recommend it.

4. 成语、谚语或俗语：

- You can't go wrong with a tried-and-true method.

- "Better safe than sorry" - so I recommend being prepared.

以上句式和表达方式都可以用来推荐事物，根据上下文和语义来选择最合适的表达。熟练运用这些高级句式能让你的英语表达更加丰富多样。