I am working in a project where I need to identify the object(s) of an English sentence. Is there any tool or work that can help identify the object(s) of a sentence? I will be very grateful for your help.
You'll need a parser to identify objects automatically. There are a few online interfaces to natural language parsers. For example, you could use the Stanford parser (link) and look for "dobj" to find direct objects.
An alternative to the standford parser is called Freeling, it does a pretty good job but is a bit harder to use.