turn的Past Tense is 什麼?

Simple Present Tense: turn
Simple Past Tense: turned
Simple Future Tense: will turn
or
is/am/are going to turn
Present Continuous Tense: is/am/are turning
Past Continuous Tense: was/were turning
Present Perfect Tense: has/have turned
Past Perfect Tense: had turned

turn
動變: turned; turned; turning
名複: turns

http://hk.dictionary.yahoo.com/search.html?s=turn&t=v