Gulp watch...isn't watching? - gulp

Question

I am setting up my gulp.js file and everything is working fine except for gulp.watch. When I run "gulp" in the terminal, gulp runs through each task but doesn't watch for changes. Is there something I should change?
var gulp = require('gulp'),
sass = require('gulp-ruby-sass'),
autoprefixer = require('gulp-autoprefixer'),
minifycss = require('gulp-minify-css'),
jshint = require('gulp-jshint'),
uglify = require('gulp-uglify'),
imagemin = require('gulp-imagemin'),
rename = require('gulp-rename'),
concat = require('gulp-concat'),
notify = require('gulp-notify'),
cache = require('gulp-cache'),
livereload = require('gulp-livereload'),
del = require('del');
// Styles
gulp.task('styles', function() {
return gulp.src('src/css/main.scss')
.pipe(sass({ style: 'expanded', }))
.pipe(autoprefixer('last 2 version', 'safari 5', 'ie 8', 'ie 9', 'opera 12.1', 'ios 6', 'android 4'))
.pipe(gulp.dest('build/css'))
.pipe(rename({ suffix: '.min' }))
.pipe(minifycss())
.pipe(gulp.dest('build/css'))
.pipe(notify({ message: 'Styles task complete' }));
});
// Scripts
gulp.task('scripts', function() {
return gulp.src('src/scripts/**/*.js')
.pipe(jshint.reporter('default'))
.pipe(concat('main.js'))
.pipe(gulp.dest('build/scripts'))
.pipe(rename({ suffix: '.min' }))
.pipe(uglify())
.pipe(gulp.dest('build/scripts'))
.pipe(notify({ message: 'Scripts task complete' }));
});
// Images
gulp.task('images', function() {
return gulp.src('src/images/**/*')
.pipe(cache(imagemin({ optimizationLevel: 3, progressive: true, interlaced: true })))
.pipe(gulp.dest('build/images'))
.pipe(notify({ message: 'Images task complete' }));
});
// Default task
gulp.task('default', function() {
gulp.start('styles', 'scripts', 'images');
});
// Watch
gulp.task('watch', function() {
// Watch .scss files
gulp.watch('src/styles/**/*.scss', ['styles']);
// Watch .js files
gulp.watch('src/scripts/**/*.js', ['scripts']);
// Watch image files
gulp.watch('src/images/**/*', ['images']);
// Create LiveReload server
livereload.listen();
// Watch any files in dist/, reload on change
gulp.watch(['build/**']).on('change', livereload.changed);
});

Answer 1

Yes, because the watch task was not called.
Add the watch to your default task
// Default task
gulp.task('default', ['watch'], function() {
gulp.start('styles', 'scripts', 'images');
});