As an example, typing in わたしはヘススです。requires Hiragana, Katakana, and Hiragana again. The quickest way to write this sentence starting from the US English Keyboard would be as follows (assuming you enabled the Command-Space Bar switching method:
- Press Command-Space Bar.
- Type the following keys: “watashiha “.
- Hold down the Shift key to switch to Katakana, then type “HESUSU “.
- Let go of Shift to switch back to Hiragana, and type “desu.”