If you want to input Chinese Pinyin and Chinese characters in your computer, now, I will strongly recommend “Google Chinese Pinyin Input Method” which launched by Google. After installed, to shift your input method to Google Pinyin. Then just wag your fingers to type Chinese characters by Pinyin. Enjoy it.
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There are few tips in the following for this excellent tool.
1.How to input Pinyin with different tones.
2.How to switch between traditional Chinese and simplified Chinese