1 Please look at this picture 改为 同义句
Please（ take ）（ a ）look at this picture .
2 That 's a very interesting book.(改为感叹句)
（ What ） （ an ）interesting book!
look at 和 take a look at 意为“看一看”.
感叹句 What+a+形容词+名词+ 陈述语序
How +形容词+ a +名词+ 陈述语序