is there any specific formula to recognise diff. b/w transitive and intransitive verbs
A transitive verb is a verb that denotes an action which passes over from the doer or subject to an object.
The mother fed the baby;
He filled up the form;
They enjoyed the party, etc.
An intransitive verb denotes an action which does not pass over to an object, or which expresses a state or being.
He ran a long distance;
The balloon burst in the sky;
Please keep quiet, etc.
A matter needs to be noted here that most verbs can be used both as transitive and as intransitive verbs. It is, therefore, better to say that a verb is used transitively or intransitively rather than that it is transitive or intransitive.
Hope this helps you locate the transitive and intransitive verbs in the given sentences.