Periodontal disease in children.. although periodontal disease is more prevalent in adults, it's important for parents to realise that the disease affects all age groups. about 10 per cent of american children suffer from a virulent form of gum disease known as juvenile periodontitis. this rapidly advancing form of gum disease usually strikes the permanent teeth of otherwise healthy children. the disease often lacks symptoms, and the gums appear normal often, routine dental radiographs reveal bone loss around the teeth, and the disease is then diagnosed. some research indicates that a plaque-induced gum infection is responsible for the disease; others blame hormonal changes taking place during adolescence that may affect the body's immune system, recent research suggests the disease may be hereditary and transmitted through the mother's genes. when diagnosed early, juvenile periodontitis can be treated. if neglected, it can spread beyond the initially affected teeth to the remaining teeth and result in loss of permanent teeth remember, check your teeth often for signs of guni disease. practice good oral hygrene at home, and see your dentist regularly for professional cleansing and treatment. early detection and treatment of periodontal disease can save time and spare painful, costly complications. задайте 5 вопросов к тексту: общий, альтернативный, спец, разделительный и к подлежащему

Vladimir, a very beautiful city. There are many attractions, such as the Golden Gate Church of the Trinity, and more. This is one ofthe oldest Russian cities. There are beautiful parks and alleys. There are many rivers and beaches. I love a legend associated with the history of the most famous gorodaOdna urban legends connected with the history of conversion of the Golden Gate. In 1767, Vladimir visited Catherine II. But immediately get into the city to the Empress could not - according to one version, her carriage is stuck in the arch of the Golden Gate (despite the 5-meter width of the arch), on the other - Catherine simply afraid to pass under the arch, since that is in disrepair. After this incident, the Empress ordered to repair the monument and demolish part of the fortress rampart, directly adjacent to the walls of the gate to the city could enter freely.

The past simple tense is quite straightforward. The main problem is its spelling rules, which you’ll find below.

We use the past simple to describe an action that started in the past and ended in the past. It could be something that happened twenty years ago or something that happened two minutes ago. It started. It stopped. It’s over.

I visited a client in London yesterday.

She planned the event all by herself.

The most common time expressions used for the past simple are: yesterday, a week (month, year) ago, last (month, year, weekend, Monday) night, the day before yesterday, two days (months, years) ago. The time expression appears either at the beginning or at the end of the sentence – never in the middle of the sentence.

Forming the Past Simple

Subject Verb + d, ed, ied

or irregular form (V2) Rest of Sentence

I / He / She / It You / We / They walked to the shop yesterday

slept late last Saturday

The past simple is usually formed by adding d, ed, or ied to the base form of the verb, however, in English there are many irregular verbs that take on a completely different form in the past tense. Some people call this the V2 form of the verb. The best thing to do is to try and memorize them.

Negative Sentences in the Past Simple Tense

Spelling Tip

When shortening the 3rd person (he, she, it) negative, just remove the o in not and add an apostrophe (‘)

did not > didn’t

To create a negative sentence in the past simple, use didn’t (did not) + the base form of the verb.

Note: Save the long forms (did not) for when you want to create emphasis. When speaking, put the stress on ‘not’.

Subject didn’t + verb in the base form Rest of Sentence

I / He / She / It You / We / They didn’t walk to the shop yesterday

didn’t sleep late last Saturday

I didn’t talk to John yesterday.

He didn’t steal those ideas from the company.

You didn’t show me the photos from the wedding.

Ron did not sign the document.