In English, participle clauses can be used to provide more concise sentences by replacing relative clauses (also known as attributive clauses). This involves using the present participle form of the verb (ending in -ing) to modify a noun directly. Here’s how you can rewrite the given sentences:
The man who is speaking now is our new secretary.
Replace 'who is speaking' with the present participle 'speaking':
"The man speaking now is our new secretary."
The apparatus that stands on the table in the corner of the laboratory is quite new.
Replace 'that stands' with the present participle 'standing':
"The apparatus standing on the table in the corner of the laboratory is quite new."
This change improves the sentence by making it shorter and more direct, while still providing the same information.