<p>Time: Time is the progress of events that occur from the past, through the present, to the future.</p><p>Time line: a linear representation of important events in the order in which they occurred.</p> <h3>Electrical safety：</h3><h3>Electrical accident,<span style="white-space: normal; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.301961); -webkit-text-size-adjust: auto;"> Cord:绳索，zapped by electricity起火，get zapped被电击，</span></h3> <h3>Swimming safety:</h3><p style="white-space: normal; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.301961); -webkit-text-size-adjust: auto;">deck：游泳池边上，甲板。Shallow (水）浅的，rough play粗野的运作。</h3> <h3>Walking safety</h3> <h3>Safe in the car</h3> <h3>Body safety</h3> <p>Supplementary 4: present tense and past tens</p><p>Time: Time is the progress of events that occur from the past, through the present, to the future.</p><p>Time line: a linear representation of important events in the order in which they occurred.</p><p>Verb: the word that for one action(run, walk, hit) or a state of being(be, exist, stand, enjoy) or an occurrence(happen, become). 发生，出现。</p><p>Noun: word that can be used to refer to a person or place or thing</p><p>There are two tenses in English—past and present.</p><p>The present tenses in English are used: to talk about the present, to talk about the future.</p><p>The past tense in English is used: to talk about the past, to talk about things that are imagined /ɪˈmædʒɪn/ rather than true. For politeness /pəˈlaɪtnəs/ .礼貌</p><p>See-saw, go-went, swim-swam, fly-flew, catch-caught, drink-drank, eat-ate, ring-rang.</p><p>Regular verbs follow these rules when we change them:</p><p>1: ending in e add d: live-lived, stare-stared.</p><p>2: ending in vowel +V, add ed: stay-stayed, play-played. /ˈvaʊəl/ 元音</p><p>3: ending in consonant+y, change y to I and add ed: try—tried, carry—carried. /ˈkɑːnsənənt/辅</p><p>4：one syllable, single vowel and ending in single consonant, double the final consonant and added: nod-nodded, rip-ripped. /ˈsɪləbl/音节， </p><p>5: two-syllable, stress on对…的强调second syllable and ending in single consonant, double the final consonant and add ed: commit-committed, prefer-preferred.</p><p>Irregular verbs do not follow any rules, so we have to learn these ones as they are: speak-spoke, teach-taught, hang-hung, ride-rode, begin-began, break-broke, build-built, draw-drew, eat-ate.</p><p>Practice:</p><p>Today i wake, yesterday i woke. Today i see, yesterday i saw.</p><p>Today i teach, yesterday i teached. Today i hang, yesterday i hang.</p><p>Today i hear, yesterday i heard. Today i ride, yesterday i rided.</p><p>Today i speak, yesterday i spoke. Today i build, yesterday i builded.</p><p>Today i ring, yesterday i rang, today i blow, yesterday i blew.</p><p>Today i break, yesterday i broken.</p>