паскакаль

1.)
begin
    if Y1 then
        begin
            if Y2 then
                C1;
        end
    else
        begin
            if Y3 then
                C2;
            else
                C3;
        end
end

2.)
begin
    while Y1 do
        begin
            if Y2 then
                C1;
            else
                C2;
        end
end

3.)
begin
    while Y1 do
        begin
            while Y2 do
                begin
                    C1;
                end
        end
end

4.)
begin
    if Y1 then
        begin
            if Y2 then
                C1;
            else
                C2;
            if Y3 then
                C3;
            else
                C4;
        end
    else
        begin
            while Y4 do
                begin
                    C5;
                end
        end
end

5.)
begin
    if Y1 then
        C1;
    else
        C2;
    repeat
        C3;
    until Y2
end

6.)
begin
while Y1
    begin
        repeat
            C1;
        until Y2
    end
end