Present participle; Past participle - underlining - underlined Present - underline - underline - underlines - underline - underline - underline Past - underlined - underlined - underlined - underlined - underlined - underlined Future - will underline - will underline - will underline - will underline - will underline - will underline Present conditional - would underline - would underline - would underline - would underline - would underline - would underline Present Perfect - have underlined - have underlined - has underlined - have underlined - have underlined - have underlined Past Perfect - had underlined - had underlined - had underlined - had underlined - had underlined - had underlined Future Perfect - will have underlined - will have underlined - will have underlined - will have underlined - will have underlined - will have underlined Past conditional - would have underlined - would have underlined - would have underlined - would have underlined - would have underlined - would have underlined Imperative - - - underline - - - - - - - -