现在分词作前置定语，为简单的定语从句省略，现在分词与修饰语之间，为逻辑上的主谓即可。如：

the coming week → the week that will come

the following questions→ the questions that follow

running water → water that is running

a developing country→ a country that is developing

the suffering people → people who are suffering

a missing child→ a child who is missing

a sleeping baby → a baby who is sleeping.

a barking dog→ a dog that is barking

flying birds → birds that are flying

smiling faces →faces that are smiling

a floating boat → a boat that is floating

falling leaves → leaves that are falling

boiling water → water that is boiling

the setting sun → the sun that is setting

the rising sun → the sun that is rising

以及你这里给出的：

the eating child→ the child that is eating

the playing child→ the child that is playing

the looking child → the child that is looking

the sitting child → the child that is sitting

均符合语法，你是从哪里得知这些是不符合语法的呢？我想看一下作为参考。