5) Errors in Tenses

I am sure 'tense' means 'tension' to most of you but in sentences 'tenses' are very important as they indicate time.We also need certain aspects like 'Simple','Progressive','Perfect' and 'Perfect Continuous' to indicate how the action occurs in the Past, Present and Future Tense.
Let us see with an example of the verb 'go'
A) PRESENT TENSE:
Simple Present tense indicates universal truths, habitual actions.
eg. He goes to Career Launcher (everyday).
Present Continuous tense indicates an action that happens at the time of speaking.
eg. He is going to Career Launcher.
Present Perfect tense indicates the recent or unknown past time.
eg. He has gone to Career Launcher.
Present Perfect continuous tense indicates an action that started in the past but is continuing even now.
eg. He has been going to Career Launcher.
eg. I have been staying in Mumbai for the past ten years.

B)PAST TENSE:
Simple Past tense is used to indicate short and long events in the past.
eg. He went to the market.
Past Continuous tense is used to indicate two simultaneous actions in the past or an action happening at the specific time
eg. I was eating lunch when the doorbell rang.
Past perfect tense indicates that something occurred before another action in the past or something happened before a specific time in the past
eg. The child had slept before its mother reached home.
Past Perfect continuous tense indicates that something started in the past and continued until another time/ event in the past
eg. He had been waiting for half an hour before the train arrived.

(C) Future Tense
Simple Future tense indicates a specific time in the future when the action takes place
eg. I will meet him later.
Future Continuous tense indicates an action at a particular moment in the future
eg. I will be visiting the dentist at 9 a.m. tomorrow.
Future Perfect tense is used to indicate an action that is completed before something in the future OR to indicate the duration before something in the future
eg. By next year, I will have taken GMAT.
Future Perfect Continuous tense is used to indicate a continuous action that started at some point and continues into some point in the future
eg. The teacher will have been reading the novel for two hours by the time the train arrives.