words

Only if you're going to need to speak or write them all (meant as humor).

Seriously, the average English-speaker might use approximately between 5-10% of the entirety at most; however, having the ability to figure out far more than the 5-10% from the context would be helpful as regards participation in regular conversations. Having a decent English speaking course or tow and access to a decent dictionary is very helpful.

For example, there would not be the need to understand technical, academic medical or scientific words in every-day conversation.

Here's a link that might help you understand the common ever-day usage of English speaking vocabulary a bit better:

http://skeptics.stackexchange.com/questions/6010/are-there-20-000-english-words-in-the-average-adults-vocabulary

it is kind of you to offer me the links! thank you very much beyond words!*^_^*

Anna, Your English is much better than my ability to write your native language. Keep studying and writing. It takes time and you will do well.

Thank you very much！And I will keep what you said in my heart.

Hello! May I ask that the link you offered to me is another website where we can ask any questions? Thank you if you apply to me .